The Secret Passage by Fergus Hume

Excellent murder mystery. On September 9, 1905, the NY Times Saturday Review of Books described this book as follows: “That painstakingly ingenious person, Fergus Hume, has devised another of his hide-and-seek, jack-o’-lantern murder mysteries. It begins with a queer and rich old woman found stabbed to death in her chair and not a clue to the murderer. Then so many clues turn up that even the story-book detective is bewildered. Then nearly everybody turns out to be somebody else under an alias, and all the clues lead nowhere…”