"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."

"Throw some gravel at it," said Hugh. "That'll get him up if he's there."

This plan was followed, but with no success.

"He's out," said Bob finally. "What'll we do?"