I slipped the card through the slot, hands shaking. The door opened and I flicked on a light.

The room was square and huge. Some kind of staging area for dioramas. Its smell made me gag, at once musty, sweet, and bitter-equal parts rot, animal odor, chemicals. A lifelike figure of a Neanderthal stood with its back to me, half-covered with hair. African tribal masks were lined up on a table next to bottles of cleaning fluid. Some kind of deity was sitting on a table, its headdress practically touching the low ceiling. It smiled down, surrounded by goats and cattle, balancing what looked like the sun in one hand and the moon in another.

In the center was a blocky wooden table about waist-high. On it were furry hides, rocks and gems, half-stuffed bird specimens, tools, half-used tubes and jars, lengths of rope. A strange raccoonlike creature seemed to be staring at me, but its eyes were missing and the bottom half of its body trailed over a mold like a baggy dress. All around the room were shelves, open wooden cases, cabinets with big doors. I went to work, opening them one by one, pushing aside tiny heads, bushy tails, flattened birds, a box of fake animal eyes, and what seemed to be a rhinoceros horn.

No Loculus . . . nothing . . . nothing.

"Argggh . . ." In frustration I banged my hand down hard on the center table. The deity seemed to jump.

The voices down the hall-Dad's and Maria's-had stopped.

But my eyes were rooted to the deity's left hand. To the replica of the sun it was holding high. It was painted a metallic gold and it seemed somehow too big for the statue's hand. Bigger than a basketball.

And it was moving.

No.

I stepped closer and realized the object was perfectly still. Its surface-the paint itself-seemed to be in motion somehow, flowing slowly and unevenly around the sun. Light seemed to glow dully from within and then fade.

I placed my hands around it and pulled upward. I felt an excruciating twinge in my injured shoulder, where the griffin had nabbed me.

The sun separated from the deity's hands. I had it now. And warmth was taking hold of my entire body. It oozed slowly across my shoulder, tickling my skin. My body hummed with the Song of the Heptakiklos, every ache smoothing out as if the pain were being lifted out by invisible strings. I watched an open sore on my arm scab and fade.

He . . . ling.

I thought of Professor Bhegad, and for a moment I wanted to cry. This was what we could have saved him with. Gencer's theft from the Mausoleum ruins had cost Bhegad's life.

But I could hear the old man's scolding voice in my head, telling me that this was what he wanted. If my sacrifice brings forth a Loculus, at least my life will have had some worth.

We had three of them now. We were almost halfway there.

I felt an intense glow of well-being. The only thing that hurt was my face, because of the huge smile that was stretching across it.

"Eureka."

Maria's voice shocked me out of my stupor. I spun around to the door, nearly dropping the Loculus of Healing.

She stood in the door with my dad. His eyes were wide with panic. "I . . . found what we were looking for," I said.

With a quick shove, Maria sent him sprawling against a cabinet. In her right hand was a long gun with a silencer.

"You got here first," she said. "But I get the prize."

CHAPTER FORTY-FIVE.

SHOULDN'TS I HEARD THE clatter of fossils raining down around Dad. Out of the corner of my eye, I saw him covering his head with his arms. But I couldn't take my eyes off the weapon. "Your name isn't really Maria, is it?" I said. "And you don't work for the museum."

The woman smiled. "Maria is indisposed at the moment. I expect she will eventually want this uniform back. You will be considerate and avoid soiling it with your blood, won't you? Now, to business."

She held out her free hand, palm up.

The beeping of Dad's phone made me jump. Cass and Aly.

"Don't even think of answering that," the woman said. "And don't even think of not handing the Loculus over."

"Give it to her," Dad said.

My brain shouted at me with shouldn'ts. I shouldn't have let down my guard. Shouldn't have left without Cass and Aly. Shouldn't have assumed that we would beat the Massa here.

Shouldn't have allowed myself to hope.

The phone stopped ringing. I had no choice now.

My body was strengthening by the second, but it didn't matter anymore. I moved my arms toward Maria, holding out the golden orb. "Give my regards to Brother Dimitrios," I said. "And tell him we won't give up."

"Oh, I'm not through with you, Josh-or-maybe-James." With a mocking laugh she stepped forward, taking the Loculus from my hand. "Brother Dimitrios is expecting three of these, and so now you can just lead me to the others."

"They're right here," Dad piped up. "I have them!"

I spun around. Out of the shadow came a jagged black fossil, hurtling straight for the woman's face.

She flinched, turning away. The stone caught her on the side of the head with a thud both solid and sickening.

With a tiny, involuntary scream, she fell to her knees. I lunged forward, grabbing the Loculus from her hand.

Dad was scrambling across the room. His own head was bloody. He yanked away the gun with one hand, shoving her down to the floor with the other.

The rope.

I grabbed it off the center table and tossed it to Dad. Dropping the gun, he took the woman's arms and held them behind her back. She thrashed and cursed, but he managed to tie her wrists tight.

"That was a petrified dinosaur jaw I conked her with," he said, catching his breath. "Guess it qualifies as a blast from the past."

The woman kicked with her legs but only succeeding in turning herself faceup. "You won't succeed," she said. "You know this."

"That's what my high school wrestling coach said to me thirty-two years ago," Dad said. "But look-he was wrong!"

"Are you okay?" I asked him. "Your head . . ."

"To quote my favorite son," Dad replied with a wry smile, "'it's only a flesh wound.' Now let's find your friends. And be very careful. There are probably more Massa where this charming lady came from."

We ran out of the room to the sound of the woman's threats. I held tight to the Loculus of Healing. "On the way down," I said, "grab my arm. You'll feel a lot better."

CHAPTER FORTY-SIX.

ANOTHER EXIT.

"WHERE THE HECK are you?" was Aly's greeting to me over the phone.

"Heading to the front entrance, near the Roosevelt statue, with Dad." I held Dad's phone tight to my ear as he and I charged down the stairs. "I have the Loculus in my backpack."

"You found the Loculus?" she shrieked.

"Aly, listen," I said. "The Massa are here. We ran into one of them. She's upstairs, third floor, all tied up. But there are bound to be others, so be careful. And hurry!"

"On our way," Aly replied. "Cass says emosewa. So do I!"

Shutting the phone, I gave it back to Dad. He led the way, racing past the elephant exhibit, but he stopped short of the museum's huge entrance hall. Ducking behind the archway, he whirled around, mouthing "Police."

I ran up next to him and carefully glanced into the hall. Near the giant skeleton, two policemen were peppering a night custodian with questions. Beyond them, outside the main glass doors, I could see the flashing red-and-blue lights of their car at the bottom of the outer stairs.

"What are they doing here?" I whispered.

"We took uniforms, so did the Massa," Dad said. "The real Maria was assaulted. Anybody could have called in a report. Let's use another exit. I'll call Cass and Aly."

As he pulled out the phone, Cass's voice boomed out loudly: "Woo-hoo, we're back in ssenisub!"

I spun around, wincing. Cass and Aly were hurrying toward us. Dad waved frantically, and I put my finger to my mouth to shush them. The conversation out in the exhibit hall stopped. "Hello?" a deep voice called out.

"Go back!" Dad whispered to Aly, Cass, and me.

"We can go invisible!" I whispered. Cass started to shrug off his pack, where the Loculus of Invisibility was stashed.

"No time!" Dad whisper-shouted. "Get to the other exit-Seventy-Seventh Street, where the restrooms are. I'll stall these guys."

"But-" I protested.

"Go! I will meet you!" Dad said. "Protect the Loculi!"

I could hear footsteps approaching. Dad gave me a shove and Aly took my arm. She quickly gave me back my phone and I shoved it in my pocket, stumbling back across the elephant exhibit hall with her and Cass. He led us through the museum, past the watchful eyes of thousands of dead animals.

We burst into the exhibit hall with the longboat. Standing in our path, his back to us, was a museum guard. As we stopped short, he turned around, startled.

His eyes went wide and he whipped his radio out.

"Run!" I shouted.

We made a break for the exit, going the long way around the boat. The guard was shouting into the radio now, reporting on us. The police would be here any second.

I raced to the exit. Someone in a black leather jacket and a watch cap was standing outside in the driveway. His back was to us and he was staring across the street. A guard? A cop?

We had room behind him. We could make it.

I slipped through the door with Cass and Aly right behind. The guy turned around, and the light caught his face.

He smiled, and we stopped in our tracks.

"Dudes!"

My legs locked. I blinked my eyes once, twice.

Only one response was possible.

"Marco?"

CHAPTER FORTY-SEVEN.

THE PRODIGAL SUNSHINE.

HE LOOKED OLDER. Bigger. But that was impossible.

Everything about this moment was impossible. He wasn't supposed to be here. He wasn't supposed to be smiling at us, like nothing in the world was wrong.

"'Sup, Brother Jack!" Marco bounded toward us, right hand held high. "Aly, my pal-y! Cass but not least! Fives!"

All three of us backed away. Cass looked afraid. Aly could barely contain the disgust on her face. "How-how did you get here, Marco?" I said.

"Clicked my heels three times and said 'There's no place like the Big Apple'! Plus Brother D has private wings." Marco slowly lowered his hand. "What, no high fives for your Prodigal Sunshine?"

"A joke . . ." Aly said, her voice simmering. "It's all a big joke to you. Well, you just laugh your head off about this news, Marco-Professor Bhegad is dead."

Marco glanced at Aly warily. "Wait. For reals?"

"Your people did it," Cass said. "They injured him at the island. We rescued him, and then he sacrificed himself so we could get a Loculus." He was looking at Marco with crazy intensity, as if he stared hard enough he might flip a sanity switch. "We almost died, Marco. Jack just had a treatment. So did Aly, and me. The episodes are coming quicker. Time's running out."