Literature professor Harriet "Harry" Wild (Jane Seymour) is adjusting to retirement when she's mugged. While recovering at the home of her son (Kevin Ryan), a detective in the Dublin police, Harry gleans a clue for his current case. But when she's rebuffed, Harry decides to solve the crime herself. Recruiting an unlikely young sidekick (Rohan Nedd), she finds a new path as a private investigator.

Mrs Sidhu (Meera Syal) is a caterer with a taste for solving mysteries. Her sleuthing turns into an unofficial partnership with dour DCI Burton (Craig Parkinson), who reluctantly accepts that together they make the perfect pairing to fight crime.