First broadcast 1st/2nd April 2012.
Following the suicide of colleague Lizzie Fraser, who he believes was scapegoated by police for a wrong decision, Leo comes to work in an angry, bitter mood.
Emilia Fox - Dr. Nikki Alexander
Tom Ward - Dr. Harry Cunningham
William Gaminara - Professor Leo Dalton
Adrian Lukis - Simon Avery
Victoria Wicks - Lizzie Fraser
Helen Sheals - Wraith
James Larkin - Greg Matheson
David Kirkbride - Lee
Jacob Anderson - Dave
Vincent Regan - Det Supt Tom Byrne
Annabel Canaven - Mary
Jaye Griffiths - Janet Mander
Nick James - Luke (as Nicholas Fagg)
Shelley Conn - DI Connie James
Adam Best - DS Winter
Lynda Rooke - Ursula
Nick Hobbs - Mick
Kirsty Bushell - DI Ginny Gray
Matt Owens - Leading Firefighter
Harmage Singh Kalirai - Dabir Amar
Rachael Fagan - Nurse (as Rachel Fagan)
Marian McLoughlin - Deborah Harding
