First broadcast 9th/10th January 2017.
When teacher Lucy Chatham is abducted Nikki and Jack help police officers Andy Steemson and Karen Wretzy investigate the circumstances of her disappearance whilst Thomas assists abrasive DS Maureen Steele when ex-addict Tina Lunt is murdered.
Emilia Fox - Dr. Nikki Alexander
David Caves - Jack Hodgson
Richard Lintern - Dr. Thomas Chamberlain
Liz Carr - Clarissa Mullery
Nathalie Buscombe - Lucy Chatham
Pippa Duffy - Alice
Daisy Edgar-Jones - Jessica Timpson
Alex Felton - Jasper Lampton
Todd Von Joel - Bearded Mechanic
Sidney Kean - Maconi
Natalie Lester - Tina Lunt
Darren Morfitt - DCI Andy Steemson
Saskia Reeves - DS Maureen Steele
Anneika Rose - DS Karen Wretzy
Dominic Rowan - Nick Timpson
Michael Ryan - Wesley Beale
Steve John Shepherd - Alec Porter
Anna Wilson-Jones - Ellie Timpson
George Alagiah - News reader
Connor Arnold - Simon
Tamer Doghem - Ali the mechanic
Jack Gogarty - Young Alec
Tom Leach - Young Nick
Ania Marson - Grace Hockney
Struan Rodger - Mike Liston
Tamsin Topolski - Young Ellie
