Second half of the nineteenth century. The brigantine Mary Celeste, whose crew disappeared without a trace, was found in the Atlantic. And this is far from the only mystery of the strange ship. Sixteen years later, a young detective nicknamed Kestrel is trying to unravel the traces of this long-standing tragedy. In search of the truth, he will have to grapple with the mad Jack the Ripper and meet the mysterious Guardians, visit the mysterious Prisoner in Newgate Prison, descend into the bottomless London catacombs and face the powerful master of “night London” - the King of Thieves himself.