They discussed the war and the possibility of sending American troops to
France. Hugh wanted to go into the aviation corps when he was old enough
but Bob thought the infantry and solid ground under his feet would be
good enough for him.

Presently they came near home. Hugh lived two blocks farther down
the street than Bob and consequently he had to pass the Cooks' house
on his way.

"There's the Wernbergs'," said Bob. "A light in the second story back
window, and two automobiles in front."

"Do you suppose they're up to anything?" exclaimed Hugh.

"I suspect them all right, but how can we prove it?"

"I have an idea," Hugh exclaimed suddenly. The two boys were standing on
the opposite side of the street from the Wernbergs' house, regarding it
curiously.

"What is it?"

"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."