“I tell you. Mr. Holmes, this man collects women, and takes a pride in his collection, as some men collect moths or butterflies. He had it all in that book. Snapshot photographs, names, details, everything about them. It was a beastly book⁠—a book no man, even if he had come from the gutter, could have put together. But it was Adelbert Gruner’s book all the same. ‘Souls I have ruined.’ He could have put that on the outside if he had been so minded. However, that’s neither here nor there, for the book would not serve you, and, if it would, you can’t get it.”

“Where is it?”

“How can I tell you where it is now? It’s more than a year since I left him. I know where he kept it then. He’s a precise, tidy cat of a man in many of his ways, so maybe it is still in the pigeonhole of the old bureau in the inner study. Do you know his house?”

“I’ve been in the study,” said Holmes.