After a while Penny dozed off. When she awoke she gathered up her writing things and walked back to the house. She chanced to be wearing tennis shoes and so made very little noise as she entered.

Penny had no intention of trying to spy upon Mrs. Masterbrook. In fact, she had forgotten all about the housekeeper as she made her way toward her own bedroom.

The kitchen and living rooms were in order but quite deserted. The significance of this did not dawn upon Penny.

Then she came to the doorway of her father's bedroom. She might have pa.s.sed it without a glance had she not heard a startled cry.

"Oh, I didn't hear you come in!" muttered Mrs. Masterbrook in confusion.

The woman had been caught in the act of examining letters and papers contained in Mr. Nichols' suitcase. She straightened up quickly, a deep flush spreading over her cheeks.

"Mrs. Masterbrook!" said Penny sternly. "Kindly explain the meaning of this! Why are you prying into my father's private papers?"

CHAPTER V

A Night Visitor

"How dare you accuse me of such a thing!" exclaimed Mrs. Masterbrook angrily. "I merely came into this bedroom to do the work for which I was hired."

"Did my father employ you to read his private letters?" asked Penny coldly.

"I was cleaning the room and I thought I would unpack the suitcase. I had just come upon these letters when you walked in."

"I'll relieve you of them now," said Penny. "Hereafter, please don't touch anything either in father's suitcase or my own."

Mrs. Masterbrook did not trust herself to reply. With an angry toss of her head she marched back to the kitchen, slamming the door behind her.

"I don't care if she is out of sorts!" Penny thought. "Dad ought to discharge her for a trick like this."

She returned the letters to the suitcase and after locking the bag took the key with her. Later in the afternoon when Mr. Nichols came back to the cottage in company with one of the telephone men, she drew him aside to reveal what the housekeeper had done.

"It's nothing so very serious," the detective said. "Of course the trick was a contemptible one, but I doubt that she learned anything of interest. The letters all dealt with matters of routine business."

"But if Mrs. Masterbrook reads our letters she'll pry into other things too."

"We could discharge her," the detective said, frowning thoughtfully.

"The point is--where would we get another housekeeper on short notice?

Especially one who can cook."

"Mrs. Masterbrook does do her work well," Penny admitted grudgingly.

"I'll discharge her if you say the word, Penny."

"No, let her stay," the girl decided. "But we'll have to be very careful about what we do and say around her."

With a telephone installed, the electric lights connected, and the house stocked with groceries, Penny and her father felt that they were fairly well established in the cottage. As was to be expected, Mrs.

Masterbrook acted very distant during the remainder of the day. She went about the house with an injured air which was amusing to Penny and Mr. Nichols.

Toward evening the telephone rang.

"Why, that was a long and two short!" exclaimed Penny, springing up from her chair. "That's our ring."

"Must be a mistake," replied Mr. Nichols. "No one would be calling us so soon."

Before Penny could reach the telephone, Mrs. Masterbrook answered it.

She appeared in the doorway and said primly to Mr. Nichols:

"Long distance is calling."

"Long distance!" exclaimed the detective. "That's queer. How did anyone get my number so soon?"

"I'm sure you can't blame _that_ on me," replied the housekeeper maliciously.

Mr. Nichols went to answer the call. Penny noticed that Mrs.

Masterbrook lingered not far away, evidently listening. Upon seeing that the girl was watching, she retreated to the kitchen.

In a few minutes Mr. Nichols returned to the living room.

"I hope nothing is wrong at home," Penny said in a low tone. She was afraid the call had been from Mrs. Gallup.

"No, everything is all right," returned the detective. "That was Inspector Harris who telephoned me."

"But how did he get your telephone number?"

"Oh, he plagued Mrs. Gallup into revealing our address, and then he found that we had a telephone installed today. Worse luck!"

"Mrs. Gallup was instructed not to tell where we were unless something of great importance arose."

"The inspector evidently convinced her that this was a vital matter."

"What is it all about anyway?" Penny inquired curiously.

"Inspector Harris wants me to take a new case. Last night a big robbery was committed at Hannibal, which is the nearest town to Kendon.

The inspector thought that since I was on the scene it would be convenient for me to conduct the investigation."

"Convenient for him."

"Obviously."

Penny glanced quickly at her father. "And what did you tell him, Dad?"

"I said I wouldn't do it. This is my vacation and I mean to enjoy it."

"Good for you, Dad," Penny said approvingly.

"The inspector didn't like to take 'no' for an answer," Mr. Nichols went on. "He claimed that this was not an ordinary robbery case and that I'd be sorry if I turned it down."