"Your girlfriend's quite a firecracker," he says with a hint of admiration in his voice.

"She's not my girlfriend!" I tell him, already hurrying to put as much distance between him and me as possible. I move as quickly through the crowd as one can with a backpack on his back, and find Lizzy waiting on a bench near the front of the market. She is already halfway through a snow cone.

I sit down next to her and watch as the blue ice drips down her chin. "Words fail me," I say, pulling the Razzles out of my backpack. Candy never fails me. I rip open the packet and hold it up to my mouth. I shake it until all the Razzles empty into my mouth. Now I couldn't talk even if I wanted to.

"I know you don't approve," Lizzy says, tossing the empty cone into the garbage next to her. "But come on, that guy was totally obnoxious."

I continue to chew furiously and don't respond.

"Okay," she says. "You don't have to say anything. Let's just try the keys."

She pulls the box out from the bag on my lap and tries each key in each hole, just like we did before. One of them slides halfway into one of the holes, and we both give a little jump. But then it won't go any farther no matter how hard we push. When she's done, Lizzy tosses the whole bunch into the garbage bin.

"Why'd you do that?" I ask, almost choking on the huge chunk of gum. "We should have kept them."

"What for?" she asks.

"I don't know, but they cost me two-fifty!"

She laughs. "You paid the guy?"

"Of course I paid him! He was gonna beat me up!"

"He wasn't gonna beat you up," she says.

"I thought you only stole things that had no monetary value," I point out as we head back into the market.

"We were just going to borrow them," Lizzy insists. "He was the one who was so rude about it."

"No excuses," I demand. "No rationalizations."

"Fine!" she says. "Let's just keep going."

I pause to spit out my gum into a garbage can. Razzles lose their flavor pathetically quickly. We don't speak to each other as we scour the booths. We continue to find people who have small jars or dishes of keys, and if they don't let us try the keys for free, no one charges us more than a quarter. A girl with an NYU tank top and a hoop earring in her nose keeps turning up at the same booths and buying keys each time. At one point she and I reach for the same key, and I pull back my hand. I turn to Lizzy and whisper, "Are you gonna ask her, or should I?"

"I'll ask her," Lizzy says, and taps the girl on the shoulder.

The girl turns around and raises an eyebrow at us. "What?" she asks.

Lizzy points to the girl's nose ring and asks, "Does that hurt when you sneeze?"

Ugh! That wasn't the question! She was supposed to ask why the girl was buying so many keys!

The girl stares at Lizzy, and then shakes her head. "Why? You thinking of getting one?" she asks. "It would look good on you."

"Really?" Lizzy says, clearly flattered, although I can't imagine why. Before she can get directions to the nearest piercing place, I step forward and ask, "Why are you buying so many keys?"

The girl laughs. "What are you guys, the flea market police? I'm doing an art project. I have about a hundred keys so far," she boasts. "Sometimes I make jewelry out of them, too. See?" She moves her long black hair away from one ear. A tiny silver key dangles from a hook. "It's from my diary in fifth grade!"

"Cool," Lizzy and I say, because really, what else could we say?

"Any more questions?" she asks, letting her hair fall back down over her ear.

We shake our heads, and she turns back to the table and scoops up another dishful of keys. What if the keys to my dad's box are already a part of some art project? Or hanging from some girl's ears? Whatever happened to the good old days when all people wanted keys for was to open locks? We reached the last block of the market when Lizzy stops short and grabs my arm. "Look!"

I follow her gaze to an entire table with what looks like all different types of keys and locks in clear plastic bins. We hurry over, jostling a customer or two out of the way. This is key heaven! Small keys, long keys, fat keys, short keys. Old rusted keys, shiny new keys. My eyes can't absorb all the bounty before us.

"Where do we start?" I ask Lizzy in a daze.

She just shakes her head, equally overwhelmed.

An elderly couple sits behind the table on matching rocking chairs. They look like they'd be more at home on a rustic porch than in lower Manhatten. The man chomps on a pipe and seems unmoved by all the hustle and bustle going on around him. The woman waves a paper fan to try to cool off as she rocks ever so slowly back and forth.

"You know," I can't help but tell her, "studies have shown that using a hand fan actually takes more energy than the resulting breeze generates. So really, you're just making yourself hotter."

"What's that?" she says, c.o.c.king her ear toward me.

Lizzy pushes me aside. "Never mind him," she says loudly. Turning to me, she says, "Can we show them the box? Otherwise we could be here for hours, and I know you don't want to take the subway home in the dark."

I scramble to slip my arms out of the straps and unzip the bag. Lizzy takes the box from me and lays it gently on the table. The couple lean forward in their chairs and peer at the box with interest.

The old man takes his pipe out of his mouth and taps it on the edge of the table so the burnt tobacco falls onto the asphalt below. "That's a might pretty box you got there," he says in a gentle voice.

"Do you think any of your keys will open it?" I ask eagerly.

"Hmmm," he says thoughtfully. "Mind if I take a closer look?"

I push the box closer to him, and he lifts it up and turns it around a few times. He doesn't ask me about the words engraved on it. He mumbles to himself something about not having seen a box like this in years, and about true craftsmanship being a dying art.

"You've seen boxes like this before?" I ask. Then I turn to Lizzy and say, "If we could find the manufacturer, I bet we could get keys from them!"

"But Larry Junior said there's no name on the box," she replies.

The old man nods in agreement. "This here's handmade. Used to know a guy and his wife who sold stuff like this. But they retired from the flea market circuit a few years ago."

"Any way to contact them?" Lizzy asks. "Maybe they'd know where it came from."

The man shakes his head. "Sorry. Haven't a clue."

Lizzy and I share a disappointed look.

"But you're welcome to go through my collection and see what you can find," he says, handing me back the box. "As you can see, we got all kinds." He points to each bin in turn. "Over here you got your railroad keys, then your jailhouse keys, keys to open luggage, wind pocket watches, then there are the Ford Model T and Edsel car keys, and these here opened the rooms at the fine Seaview Motel before they went to those plastic cards." He gives a little shudder when he mentions the plastic cards.

"And here," he says proudly, pointing to a tall board attached to the end of the table, "we got our pride and joy." The board is covered with rows of hooks with very old-looking keys hanging from them. Most are rusted, and some on the bottom row are over six inches long. They look like big skeleton keys. The man tells us how he got them from all over the world and that some are hundreds of years old. They are actually very cool, and I can see why they are his pride and joy. Lizzy has been shifting her weight from one foot to the other impatiently. Finally she blurts out, "Don't you have any regular keys?"

I cringe. Lizzy really has to work on her manners. The old woman pushes herself out of her rocker and says, "Come on, George. Show the kids what they want."

"Yes, dear," the man says, winking at me. He picks up a small bin from between the watch winders and the luggage keys and hands it to Lizzy. "Give these a shot," he says. "These are the ones that don't fall neatly into any other category."

"We'll bring them right back," Lizzy promises, hugging the box close to her chest.

"You look like trustworthy kids," the woman says. "We'll be here all day."

Lizzy beams at being called trustworthy. She thanks them and quickly hurries toward the closest bench. I grab my box off the table and have to jog to keep up with her.

When I join her on the bench I notice her brow is crinkled, like she's thinking hard about something. "Something wrong?" I ask.

"I don't know," she says, gesturing to the table we just came from. "All those keys."

"What about them?"

"They were all made to open something specific, right? Like one particular lock or door or briefcase or something?"

"I guess so."

"So what if there are people all over the world-people like us-who have a lock but can't find the key? Don't you think that's kind of sad?"

Every once in a while, Lizzy says something that really makes me think. I can see her point. Two parts of a whole, separated and lost from each other. "Like swans," I say.

"Huh?"

"You know, how swans mate for life, and then if one of them dies, the other just swims around alone for the rest of its life. Keys are like that. My dad's box is like that. Only one key will fit. Well, in our case, four keys."

Lizzy considers this for a minute, then says, "Can we forget about the swans and just try these keys?"

"You're the one who brought it up," I point out.

"I did not bring up the swans!"

"You just don't like learning anything new," I argue.

"I just don't see the point of knowing a lot of useless facts."

I am not going to get sucked into this argument again. "Let's just try the keys," I say through clenched teeth.

We get about halfway down the bin when something happens. A key fits all the way into a hole! All the ridges line up. I keep slipping it in and out to make sure it's really happening. Lizzy grabs my arm and squeezes. "Does it turn?" she asks breathlessly.

I try to turn it in both directions, but it won't move. I shake my head and hand Lizzy the box. She tries a few times too, before giving up and slipping the key into her pocket. "Let's keep going," she says, grabbing the next key from the bin.

We don't have any more luck, but there is a new lift in our step as we walk back to the table.

"How did it go?" the man asks when we return the bin to its rightful place.

Lizzy pulls the key out of her pocket and says, "This one fit in one of the holes, but it won't turn."

The man nods. "You can keep that one, but I suspect your box was made exclusively for one set of keys. You may find a few more to fit the holes, but I doubt you'll get 'em to turn."

I look down at the box in my hand. My dad's words stare back at me and then swim a little as my eyes get watery.

"Here," the old man says, reaching up and pulling one of the big keys off the board. He hands it across to me along with a padded bag. "Take this as my gift. Anyone looking for keys as hard as you is a kindred spirit."

Surprised, I gingerly take the key from him. Some of the rust rubs off on my hand. "Thank you," I say sincerely. "What did it open?"

He shrugs. "Probably an old barn or storehouse."

"Great," Lizzy mutters. "Now we've got four locks with no keys and two keys with no locks. We're worse off than before!"

I carefully slip the key into the padded bag and put it and the box into my backpack.

"Thank you for the gift and for all your help," I say to the couple. "We really appreciate it."

"It's a shame you lost those original keys," the man says as he and his wife head back to their rockers.

I'm about to tell him that it wasn't us who lost them, but before I get a chance Lizzy says, "Don't worry, we know where they are and we're gonna find them."

I'm about to ask Lizzy what the heck she's talking about, when the old man relights his pipe and says, "Good, good. Be sure to come back and tell me what the meaning of life is once you find out."

"We will," Lizzy says, already turning away. She puts one hand on my back and starts pushing me down the aisle.

When we get far enough away I ask, "Why did you tell him we know where the original keys are?"

"Because we do," Lizzy replies. "And that brings us to the next item on my chart. The one I hoped we wouldn't have to get to."

A chill literally runs down my spine. Not a good sign in eighty-degree weather. Hoping I don't sound as worried as I feel, I ask, "You wouldn't happen to have another Milk Dud in your pocket, would you?"

Chapter 5: Plan F.

"You're kidding, right?"

Lizzy has just read the final item on her chart. My outburst causes Zilla to growl at me and position himself between the two of us. Lizzy lays the chart back down on the kitchen table.

"Our keys are hidden in Harold's office somewhere," she insists. "He said so himself. Maybe they're under the carpet in a forgotten corner of the supply closet. Or stuck in the back of a desk drawer. Or glued to the ceiling. We're gonna get into that office, and we're gonna find them."

"Breaking and entering? That's your big plan? That's illegal!" I slip carefully past Zilla and into the living room, where I begin to pace and think. The law office is all the way uptown. I'm sure Mom wouldn't approve of us going there, so I'd have to lie. Can this be the only answer? What if other people are already using that office? Maybe if we kept looking at flea markets and tag sales, we'd eventually find keys that would work? But would we find them in time?

I'm getting a bit dizzy from circling, so I sit down on the couch that, unlike ours, has no holes and no name. I practice my deep breathing. Architecturally our two apartments are identical, just flipped around. But they couldn't be more different inside. Practically everything in Lizzy's house is beige. Her dad says that it makes it easier to decorate. I have to admit, it's more calming than all the crazy colors of my place.

Lizzy comes in and sits next to me on the arm of the couch. She picks at a stray thread and doesn't look at me. "Sorry," she says. "The box is yours, and I've been acting like it's mine, too. Making all these plans, dragging you all over the city. I'll stop, and you can do whatever you're comfortable doing."

I'm so surprised by her words that at first I wonder if I misheard her. It sounded like she was apologizing for being bossy. Yes, I'm pretty sure she was! But to be honest, she doesn't have anything to apologize for.