"Is Lena still here?" asked Bob.
"Still here," said his father. "She's getting ready to leave though and you two had better be prepared."
"Where's Heinrich?"
"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.