First broadcast 17th January 2016.
The detectives are called in to deal with the case of a missing au pair who disappeared after her evening class at Night School.
Stefanie Martini - Georgina Mortmaigne
Amy McCallum - Julia Mortmaigne
Darrell D'Silva - Geoff Craven
Rob Callender - Philip Hathaway
Ben Lambert - Guy Mortmaigne
Eleanor Williams - Ingrid Hjort
Milo Twomey - Dr. Hector Lorenz
Peter Forbes - Hodges
Sam Coulson - Mark Bryden
John Draycott - Turnbull
Shaun Evans - DC Endeavour Morse
Jack Bannon - Sam Thursday
Roger Allam - DI Fred Thursday
Anton Lesser - Chief Superintendent Reginald Bright
Sean Rigby - DS Jim Strange
Dakota Blue Richards - WPC Shirley Trewlove
Hermione Corfield - Cassie Watkins
David Burnett - Ricky Parker
Hugh Simon - Professor Kemp
James Bradshaw - Dr. Max DeBryn
Tim Packham - Estate Worker with Bloodhound
Dan Trotter - Policeman
Kevin Vose - Missing Birdwatcher Moxem
