Read it through once

After the night that Wilson had partly revealed his scheme at his house, Tom had tried for several days to guess out the secret of the rest of it, but had failed. Then it occurred to him to give Roxana's smarter head a chance at it. He made up a supposititious case, and laid it before her. She thought it over, and delivered her verdict upon it. Tom said to himself, "She's hit it, sure!" He thought he would test that verdict, now, and watch Wilson's face; so he said reflectively--