After learning of a suspicious attempt to burn down a beloved old pub, The Crooked Horse, amateur detective Libby Sarjeant and her friend Fran reluctantly agree to investigate. But when a local antiques dealer mysteriously disappears after apparently taking out his boat, it appears there are dark and sinister forces at play. Can Libby and Fran uncover a connection between the fire and the missing man? And will unravelling a deadly case put them in terrible danger?