The presenter of TV holiday series Hot Shots takes a midnight swim, only for her body to be washed up on the shore. Initial evidence points towards accidental drowning, but Jack is troubled by marks on the victim's neck—and as he questions her colleagues, a secret affair, unrequited love and rocky working relationships convince the DI that this was no accident. With Florence away on a romantic weekend, JP steps up to help the DI with the case, and with the tourist board up in arms about the crime, Commissioner Selwyn keeps a close eye on the investigation.