In the smoke-wreathed gloom of a Parisian salon, Detective Bencolin has summoned his allies to discuss a peculiar case. A would-be murderer, imprisoned for his attempt to kill his wife, has escaped and is known to have visited a plastic surgeon. His whereabouts remain a mystery, though with his former wife poised to marry another, Bencolin predicts his return. Sure enough, the detective's worst suspicions are realised when the beheaded body of the new suitor is discovered in a locked room of the salon, with no apparent exit.

When Miles Hammond is invited to a meeting of the Murder Club in London, he is met instead with just two other guests and is treated to a strange tale of an impossible crime in France years before; the murder of a man on a tower with only one staircase, under watch at the time at which the murder took place. With theories of levitating vampires abounding, the story comes home to Miles when he realises that the librarian he has just hired for his home is none other than Fay Seton, a woman at the heart of this bizarre and unsolved past murder.

When a rise in London’s supernatural crime puts Fey society at risk of discovery, the Winter Council turns to an unlikely solution: Avery Hemlock, the changeling they sentenced to 500 Years of Nightmares. Inherently lacking social grace and missing approximately two centuries of world knowledge, Avery must find a way to acclimate and solve the case or lose her probationary freedom.

Sooty, sulfurous, and malign: no woman should be out on a night like this. A spate of violent deaths—the details too foul to print—has horrified the capital and the smog-bound streets are deserted. But Rachel Savernake—the enigmatic daughter of a notorious hanging judge—is no ordinary woman. To Scotland Yard's embarrassment, she solved the Chorus Girl Murder, and now she's on the trail of another killer.

A real-life detective story, investigating how Agatha Christie and colleagues in a mysterious literary club transformed crime fiction, writing books casting new light on unsolved murders whilst hiding clues to their authors' darkest secrets. This is the first book about the Detection Club, the world's most famous and most mysterious social network of crime writers. Drawing on years of in-depth research, it reveals the astonishing story of how members such as Agatha Christie and Dorothy L. Sayers reinvented detective fiction.