Mystery drama in Dorset coastal town, starring David Tennant as DI Alec Hardy and Olivia Colman as DS Ellie Miller. Hardy faces a race against time as Ellie discovers a startling new piece of evidence, forcing them to reassess their suspicions. Meanwhile, life for Mark and Beth is about to change forever, as Ellie comes under intense pressure from all sides. Also starring Charlotte Rampling and Marianne Jean-Baptiste.