Sam Claflin Laz, Joel Lazarus Actor, Executive Producer Bill Nighy Dr. L, Dr. Jonathan Lazarus Actor Alexandra Roach Jenna Lazarus Actor Ewan Horrocks Young Laz Actor David Fynn Seth McGovern Actor Karla Crome Bella Actor Kate Ashfield Detective Alison Brown Actor Lloyd Lai Rupert Yuen Actor Roisin Gallagher Laura Actor Daniel O'Hara Director Nicole Volavka Director Wayne Yip Director, Executive Producer Tom Farrelly Writer Harlan Coben Writer, Executive Producer Daniel Brocklehurst Writer, Executive Producer Richard Fee Executive Producer Nicola Shindler Executive Producer Alice Grant Associate Producer Matt Strevens Producer Sarah Warne Original Music Richard Stoddard Cinematographer Sam Heasman Cinematographer