"Can you get your automobile?"
"I guess so, if Heinrich hasn't taken the family out."
"Let's get it and follow one of those machines. In that way we can see where the people live who are at the Wernbergs'. Maybe we can learn something about them if we know who they are."
"A good scheme," exclaimed Bob readily. "We'll have to be awfully careful though; if they ever found out we were following them it might go hard with us."
"We'll be careful all right," said Hugh grimly. "Come ahead, we want to be ready to start and they may leave at any time."
The two boys walked quickly up the street, taking care to keep on the opposite side from the Wernberg home. When they arrived in front of the Cooks' they darted across the street and hurried along the driveway until they came to the garage. The door was shut and locked. Bob knocked loudly.
There was no reply. Bob looked at his watch under the light of a match which Hugh struck. It was twenty minutes of eleven.
"That's queer," he muttered. "Heinie is usually in bed long before this."
"Maybe he is now, and is asleep," Hugh suggested.
Bob glanced up at the second story window. "I don't think so," he said. "The window is closed in the room where he usually sleeps, and I know he is a crank on fresh air."