When a killer strikes close to home ... DI Ted Darling doesn't like coincidences. There are too many for comfort surrounding his latest case. They're spilling over into his private life too, when toxic family secrets are uncovered. A serial killer appears to be targeting vulnerable elderly people in care homes and despatching them in the most cynical way. Ted and his team are struggling to get a lead on who the killer really is. It doesn't help that his newest team member is adding to his problems, rather than helping him to solve them. Then an unexpected phone call brings devastating news for Ted and his long-term partner, Trevor.