Victor Silvius has spent nine years as an inmate at The Grange, a private sanatorium, for the crime of attacking judge Sir Giles Drury. Now, the judge’s wife, Lady Elspeth Drury, believes that Silvius is the one responsible for a series of threatening letters her husband recently has received, so she seeks out retired stage magician Joseph Spector. Meanwhile, Miss Caroline Silvius is disturbed after a recent visit to her brother Victor, convinced that he isn’t safe at The Grange. Someone is trying to kill him, and she suspects that the judge, who already has made Silvius’ life a living hell, may be behind it. Caroline hires Inspector George Flint of Scotland Yard to investigate. The two cases collide at Marchbanks, the Drury family seat of over 400 years, where a series of unnerving events interrupt the peace and quiet of the snowy countryside.

When a sensational killing rocks 1938 London, local newspaper ads offer a hefty sum to the person who can say whodunnit. A man has been shot dead at the top of a Ferris wheel, and his wife --- the only other person in their carriage --- insists on her innocence. But who else could have fired the deadly bullet and escaped unseen? The sheer implausibility of the claim is enough to whip the press into a frenzy. For young and idealistic Edmund Ibbs, the lawyer representing the accused, that frenzy may be his only hope at discovering the truth of the mysterious murder. As he digs into the case, Ibbs unwittingly enters a shadowy web of conspiracy and murder, soon finding himself implicated in not one but two seemingly impossible crimes.

In 1930s London, celebrity psychiatrist Anselm Rees is discovered dead in his locked study. There are no clues, no witnesses and no evidence of the murder weapon. The Scotland Yard detective on the case calls on retired stage magician-turned-part-time sleuth Joseph Spector, who has a knack for explaining the inexplicable, but even he finds that there is more to this mystery than meets the eye. When the investigation dovetails into that of an apparently impossible theft, the detectives consider the possibility that the two transgressions are related. And when a second murder occurs, this time in an impenetrable elevator, they realize that the crime wave will become even more deadly unless they can catch the culprit soon.