Since the day Penny had encountered the museum workman at the Gage Galleries, she had held to the theory that the man had something to do with the mysterious disappearance of the priceless Rembrandt. It had been her firm belief that if she apprehended Mr. Hoges for questioning, the establishment of his own guilt would result in Amy's exoneration.

But now that she had learned the two were friends, she did not know what to think. Certainly Amy's a.s.sociation with the man did not tend to point to her own innocence.

"I'll not help the girl again unless she reveals everything concerning her connection with Hoges," Penny decided. "From now on matters must take their own course."

Leaving the bedroom, she went downstairs and out the front door. The watchful detective was still stationed across the street, but Penny was so engrossed in her own thoughts that she cast only a casual glance in his direction.

She had walked a short distance down the street, when she felt a firm pressure on her arm.

"Just a minute, young lady!"

Penny whirled around to find herself face to face with the police detective.

CHAPTER XVI

Watchful Waiting

"What do you want?" Penny gasped. She felt certain the man intended to arrest her for aiding Amy Coulter to escape.

The detective stared down at her face.

"I beg your pardon," he apologized. "When you came out of that rooming house I mistook you for another."

He released his grip on her arm and continued to offer excuses as Penny walked away. She chuckled to herself, realizing that the plainclothes man had taken her for Amy Coulter. But the smile quickly left her face, for she did not feel very proud of the trick she had played on the police. If it should turn out that the girl was guilty, then indeed she would be sorry.

Dinner was over when Penny reached home, and Mrs. Gallup reported that Mr. Nichols had returned to his office to work on a case.

"Your food is in the oven, Penny," she told the girl a trifle irritably. "I declare, I can't see why you had to run off just when I was setting things on the table. Your father is the same way!"

"We're a dreadful pair," Penny agreed amiably as she dished herself up a generous helping of meat and potatoes. "Any gravy, Mrs. Gallup?"

"No, your father ate it all and I don't feel like making any more."

"Of course not. I have a big plate of food now. Just leave that pan of dishes, Mrs. Gallup, and I'll do them for you."

The housekeeper immediately softened. "You may wipe them if you like,"

she said. "I am tired tonight. I don't mean to be cross, only it's annoying to have folks late for meals. I like food to be eaten when it's good and hot."

"You're a dear," Penny laughed, giving her a squeeze. "I'll try not be late again."

After the dishes were stacked in the cupboard, Penny spent a half hour reading, then she went to bed although it was only a little after eight o'clock. She could not remember when she had been so tired.

"You're not sick?" Mrs. Gallup inquired anxiously, for usually Penny was the last one in the house to retire.

"No, I'm all right. Just sleepy."

Penny might have added that she was likewise blue and discouraged. It seemed to her that she had made no progress at all in trying to solve the mystery which surrounded Amy Coulter.

As she slowly mounted the stairs, Penny's attention was attracted by someone standing by the garage door. She paused, thinking that it might be her father. To her astonishment, the man darted back behind a group of tall bushes which banked the building.

Penny snapped out the light and watched. The man did not reappear.

"What are you doing?" Mrs. Gallup questioned.

"I think someone is watching the house. I just saw a man by the garage."

"Oh! I'll call the police!"

"No, wait!" Penny commanded. "I may have been mistaken." She said it to rea.s.sure the housekeeper.

Mrs. Gallup came to the window and peered out. There was no sign of anyone about the grounds.

"I'll take a flashlight and investigate," Penny proposed.

Mrs. Gallup caught her firmly by the arm. "You'll do nothing of the kind. We'll lock all the doors and not stir from the house until your father returns!"

The housekeeper insisted upon drawing all the blinds and fastening the doors and windows. It seemed an unnecessary precaution to Penny who believed that the prowler had gone.

An hour slipped by and the man was not seen again. Penny went wearily to bed, but Mrs. Gallup was so nervous that she declared her intention of remaining up until Mr. Nichols arrived home.

The detective drove in shortly after ten o'clock and Penny could hear the two talking in the living room. She dropped off to sleep before her father came upstairs.

In the morning Penny awoke feeling refreshed and cheerful again. After breakfast she walked to the post office, stationing herself near the General Delivery window. For an hour she watched men and women come and go, claiming their mail at the little window. George Hoges did not appear, but Penny had scarcely dared to hope that he would come so soon.

Presently, she walked over to the window and questioned the clerk who was in charge.

"Can you tell me if a man by the name of George Hoges gets his mail here?"

The clerk thumbed through a stack of letters before answering. "I don't remember the man but he'll probably call here sooner or later for he has two letters."

Penny retreated to her post near the door. It was tedious waiting.

"When I get to be a taxpayer I'll vote for chairs in every post office!" she thought.

Penny spent nearly the entire day waiting for George Hoges to appear.

By nightfall she was so weary she could scarcely stumble home. She felt certain she would not have the fort.i.tude to resume her watch the following day.

Mr. Nichols was amused when she told him of her unpleasant experience.

"A detective must learn to spend half of his time just waiting," he declared. "Why, I've handled cases where we a.s.sign men to watch a certain street corner. Perhaps they'll be required to keep it up for six months."

"That's a long time."

"Not if the man you're after comes along in the end."

"If I keep up my vigil even six days I'll have corns on the bottom of my feet," Penny sighed. "Everything considered, I don't believe I'm cut out to be a lady detective."