We start the book with a single note which seems to leave a smudge on Leonard and his family life. The book continues with himself, two sons, a daughter and a wife as well as a large extended family all making room for one more, when curiously charming 'Doctor' Tobias Taylor appears on the scene. However curiosity killed more than just a cat, as the family soon finds out.
Leonard Morley, in the very first chapter, receives a threatening note, requesting blood money in the absence of Mr Whiteley, his manager and Leonard informs his wife of it, who dismisses it avidly. However, over time more of these notes turn up, and when the fourth has found its way to Leonard, he resolves to tell Mr Whiteley. But whilst waiting to speak to him, Mr Whiteley is shot, and is lying in a pool of blood.
In the court scene, where Leonard stands as witness, all over London people flock to see the trial. In the end, Horace Rayner is charged with murder, and given a life sentence.