"He's due in about five minutes."

"You'd better watch him, father," warned Bob.

"Don't worry about that," said Mr. Cook soberly. "I suppose that you two
'things' will come to the factory later. I expect to be there all night."

"We'll try to get there," said Bob. "We'll keep track of Lena as long as
we can, and if it's possible we'll report to you at the office."

"Good," exclaimed Mr. Cook. "Don't forget to be very careful, and don't
get into trouble if you can help it."

"We'll do our best," Bob promised.




CHAPTER XXI

ON THE STREET


As Mr. Cook left the room the two boys heard the automobile come up the
driveway and stop in front of the house. Mrs. Cook and Louise were to
spend the evening with an aunt of Bob's a short distance down the street,
and Mr. Cook was to take them there in the car. Bob and Hugh waited until
they should all leave for they did not want to be seen by any one in
their disguises.