Faith Newberry's dream job may be morphing into a nightmare. Newly hired as the librarian at the upscale and pet-friendly Castleton Manor literary retreat, Faith sees her move from Boston to the quaint Cape Cod village of Lighthouse Bay, Massachusetts, as a boon.

But things turn ugly when she discovers that the first edition book by Sir Arthur Conan Doyle proudly displayed in the library - also his first in the Sherlock Holmes series - is a counterfeit, and not a very good one at that. Who could have absconded with the real volume? Could it have been the former librarian when she mysteriously disappeared leaving only a cryptic note of resignation? Or has someone else duped the handsome heir to the Castleton estate, Wolfe Jaxon?

Whichever is the case, it soon becomes clear that someone will stop at nothing to keep her from learning the truth.

Just as Sherlock Holmes had his Watson to help solve mysteries, so does Faith. Only hers is a lovable stub-tailed cat bearing the same name. Faith rescued Watson as a kitten from behind a dumpster on a freezing New England night, and he - like the fictional doctor - has become her loyal sidekick. He is Faith's friend, confidante, and sometimes her rescuer in times of peril. Together they set out to uncover the truth.

The members of the Candle House Book Club, a lively group of women headed by her aunt Eileen Piper, also join Faith in her quest for answers. Will they be able to find the missing librarian and the missing Sherlock Holmes volume before this chapter of Faith's life comes to a fatal close?