DI Will Wagstaffe and his team investigate the mysterious death of a young nurse on the London Underground in very unusual circumstances. Whilst he continues to deal with personal issues with his sister and unusual behaviour from his nephew.

Cast: Tom Riley, Edward Akrout, Alex Carter, Gregg Chillin, Clare Foster, Jonathan Harden, Siggi Holm, Natalia Kostrzewa, Jason Maza, Anjli Mohindra, Andreea Paduraru, Miranda Raison, Doug Rao