Samson O'Brien has been dismissed from the police force—quite unfairly, according to him. Now back in his home town of Bruncliffe in the Yorkshire Dales, Samson sets up the Dales Detective Agency while he fights to clear his name. However, the people of Bruncliffe aren't entirely welcoming to a man they see as trouble.

Delilah Metcalfe, meanwhile, is struggling to keep her business, the Dales Dating Agency, afloat. When Samson gets his first case, investigating the supposed suicide of a local man, things take an unexpected turn, and soon he discovers a trail of deaths that lead back to the door of Delilah's agency.

With suspicion hanging over someone they both care for, Delilah and Samson soon realize that they need to work together to solve the mystery of the dating deaths. But working together is easier said than done, and the couple must find a way to kiss and make up before more villagers wind up dead.