Set against the idyllic backdrops of Devon and Cornwall, there are plenty of cases to keep the team on their toes, including a body found in the river on the county border, a baffling chocolate box poisoning, a historic farming feud and a spiking incident on the water.

Away from the police station, Martha and Humphrey must overcome unexpected hurdles as foster parents, while the reappearance of Martha's old flame Archie presents an unexpected challenge. While Esther navigates a surprise encounter in her private life, a health scare for Anne stirs up painful memories, and Kelby embarks on a journey of personal growth.