Emilia Fox Dr Nikki Alexander Actor David Caves Jack Hodgson Actor Richard Lintern Dr Thomas Chamberlain Actor Liz Carr Clarissa Mullery Actor Toby Sams-Friedman Kevin McDowd Actor Rosie Jones Serena Prentice Actor Ian Burfield DI Alex Hunter Actor Linda John-Pierre Nurse Actor Charlie Creed-Miles Conor Flannery Actor Sanchia McCormack Clarissa's Mother Actor Abigail Bolt-Mead Young Clarissa Actor Jacqueline King DS Lindy Muddyman Actor Colin Mace Bill Gardiner Actor Timothy Prager Writer Thaddeus O'Sullivan Director Richard Stokes Executive Producer Kiaran Murray-Smith Producer