A very light, quick supernatural mystery. Honestly you could probably read the whole book in a day if you had the afternoon free. Abigail Rook is a young woman with keen observation skills and a yearning for adventure. She arrives in the New England town of New Fiddleham in the winter of 1892 and within less than 24 hours meets R. F. Jackaby, an eccentric detective of crimes involving the supernatural. Jackaby is essentially a mirror-version of Sherlock Holmes. He converses regularly with magical creatures whom only he can see, and is terrible at noticing mundane details. This makes Abigail Rook the perfect assistant. And Jackaby is desperately in need of assistance- a gory murder has just been committed in the center of town, and more will soon follow unless Rook and Jackaby can find the killer.