Emilia Fox Nikki Alexander Actor David Caves Jack Hodgson Actor Liz Carr Clarissa Mullery Actor Richard Lintern Dr Thomas Chamberlain Actor Akin Gazi Bekir Humadi Guest Star Robert McCafferty Peter Wallace Actor Michael Socha David Bennetto Guest Star Owen McDonnell Ryan Kelvin Actor Ace Bhatti Mousa Rashid Actor Tobias Menzies Greg Walker Guest Star Aaron McCusker DS Adam Kemp Actor Jane McGrath Alice Preston Guest Star Irena Micijevic Gulse Kavur Guest Star Jamie Parker Ben Morgan Actor Hugo Becker Isaac Drefus Actor Mark Tandy QC Harry Fraser Guest Star Adrian Rawlins DI John Leighton Actor Sean Gallagher DI John Brooke Guest Star Haydn Gwynne Helen Ferguson Guest Star Tom Davey City Boy Guest Star Sharon Bloom Producer Phillippa Giles Executive Producer Daniel O'Hara Director Dusan Lazarevic Director Timothy Prager Writer Ed Whitmore Writer Graham Mitchell Writer Declan Croghan Writer Graham Mitchell Writer Craig Viveiros Director Tracey Malone Writer David Richards Director Nicholas Renton Director