The glitz and glamour of London's wealthiest neighbourhood masks a dark side that Chelsea local DI Max Arnold (Adrian Scarborough, Sanditon) knows all too well. Killers lurk among the immaculate mansions and luxury stores, and it's up to Max and his new partner, DS Layla Walsh (Vanessa Emme, Dublin Murders), to expose them. Living on a shabby houseboat, with his marriage in shambles, Max seems utterly unremarkable-but behind his everyman exterior lies an unparalleled perceptiveness, a mordant sense of humour, and a knack for understanding how people tick. Newly transferred from the Exeter police, Layla isn't afraid to speak her mind, even if that means occasionally rubbing people the wrong way. She's warmhearted underneath her tough front, however, and fits right in with the team as they investigate a strangling at an art gallery, a suspicious death at an exclusive retirement home, a psychotherapist's murder, and the killing of an entrepreneur.