Chuck reluctantly agreed, and they all thought hard for the next few minutes.
"I think I have it," Phyllis said at last. "There are only two people in the house that we know of, the caretaker and Miss Pringle. Now if some one rang the bell when the caretaker was out, Miss Pringle would have to come to the door. That would leave the coast clear for you."
"Go on," Chuck prompted.
"There's nothing else," Phyllis answered. "We will just have to wait until the caretaker goes out."
Chuck groaned at the thought of time wasted.
"When's that likely to be?" he demanded.
"About sunset. He takes care of some of the furnaces in the neighborhood, so he'll be gone for quite a while," Phyllis told him.
"I'll go and watch at the corner," Chuck decided.
"What are you going to do if you find the mitten is Don's?" the practical Janet asked, and Phyllis and Chuck looked at each other.
"Notify the police," Chuck said at last, but Janet shook her head.