“He hid the stuff in the old tower.”

“He was a railwayman.”

“Why not?” shouted Joe, springing to his feet. “Why couldn’t it have been the old water tower? He used to work around here.”

“He didn’t say the old tower of Tower Mansion, after all. He just said ‘the old tower!’ ”

“Frank, I believe we’ve stumbled on the clue!”

“It would be the natural thing for him to come to his old haunts after the robbery. And if he found he couldn’t get away with the stuff he would hide it somewhere he knew. The old water tower! Why didn’t we think of it before, Joe? Why, that must be the place!”