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Miss Clara Marie Stanton's family may be eccentric, but they certainly aren't insane. London, England, 1860: When Clara's ex-fiancé begins to spread rumors that her family suffers from hereditary insanity, it's all she can do to protect them from his desperate schemes, society's prejudice, and a lifetime in an asylum. Then Clara's grandfather Drosselmeyer brings on an apprentice with a mechanical leg, and all pretense of normalcy takes wing.

When insurance investigator David Braun probes a particularly violent break-in, the crime scene raises more questions than it answers. Turning to Susan Milton of the London School of Antiquities for help, they find themselves the target of a ruthless and elusive killer as they risk their lives to expose a horrifying centuries-old secret.