New York Times bestselling series, detective of the supernatural R.F. Jackaby and his assistant Abigail Rook follow a case to a paleontological dig site in nearby Gad's Valley on the trail of a thief, a monster, and a murderer.

In 1892, New Fiddleham, New England, things are never quite what they seem, especially when Abigail Rook and her eccentric employer, R. F. Jackaby, are called upon to investigate the supernatural. First vicious shape-shifters disguise themselves as a litter of kittens, and a day later, their owner is found murdered. Then in nearby Gad's Valley, bones from a recent dig mysteriously go missing, and an unidentifiable beast starts attacking animals and people, leaving mangled bodies behind. Charlie calls on Abigail for help, and soon Abigail and Jackaby are on the hunt--for a thief, a monster, and a murderer.