When a priest from a Catholic boarding school suddenly disappears, Humphrey and Esther find that his case has uncanny similarities to a local myth – ‘The Devil on the Rocks'. Why was he last seen marching on a nearby beach in the middle of a dense fog, and where is he now?With the school's headmistress reluctant to aid the investigation, a large sum of money missing from the school safe, and the priest nowhere to be found, the team have their work cut out trying to pin down the truth.Meanwhile, Zoe helps Martha clean up Ten Mile Kitchen after a break-in, but it's clear she's hiding something. Anne's new flame helps her move onto the Lily Bond as Humphrey and Martha take over her house, but is there more to Richard than meets the eye? Eager to please, Kelby ups his game when Margo suggests his job may not be secure.