London's Chelsea neighbourhood is a beautiful borough for beautiful people, but it has a dark underside of deception, violence, greed - and murder. Bodies have a way of showing up, and things are rarely what they seem. DI Max Arnold (Adrian Scarborough, Sanditon) lives on a shabby houseboat on the Thames, just yards from some of the most valuable real estate in Europe. He's an unprepossessing figure with one of the shrewdest minds in the Metropolitan Police. His partner, Priya Shamsie (Sonita Henry, Luther), is a no-nonsense detective sergeant newly returned from maternity leave. Together, they must root out the truth behind heinous crimes and bring those responsible to justice, no matter their wealth or status.