- Shaun Parkes - DC Winston Nkata
- Paul Hickey - Lafferty
- Catherine Russell - Helen Lynley
- Cherie Lunghi - Sarah Gordon
- Phyllis Logan - Miriam Whitelaw
- Saeed Jaffrey - Akram Malik
- Peter Egan - Dr. Trenarrow
- Jodi Albert - Sally
- Indira Varma - Melissa Booth
- Blake Ritson - Graham Marshall
- Liza Tarbuck - DI Fiona Knight
- Timothy West - Andy Maiden
- Barbara Flynn - Maureen Finnegan
- David Calder - Richard Martin
- Jenny Agutter - Jemma Sanderson
- Richard Armitage - Philip Turner
- Mark Benton - Professor Elias Blackwell
- Roger Allam - Simon Featherstonehaugh
- Gabrielle Drake - Lady Asherton
- Matilda Ziegler - Christine Miller
- Sophie Ward - Justine Weaver
- Charlotte Salt - Maggie Spence
- Ronald Pickup - Sir Stuart Stinhurst
- Neve McIntosh - Olivia Whitelaw
- Amita Dhiri - Yumna Malik
- Sophie Okonedo - Eve Bowen
- Ania Sowinski - Nina Delic
- Joe Armstrong - Darren
- George Costigan - Owen Harcourt-Baines
- Sorcha Cusack - Nan Maiden
- Anthony Higgins - James Pitchley
- Daniel Ryan - Red McGuire
- Stella Gonet - Lady Sarah Keach
- Tony Haygarth - Bob Tamworth
- Camilla Power - Joanna Sydeham
- John Sessions - John Corntel
- James Hazeldine - Dennis Luxford
- Valerie Lilley - Pat McRae
- Danny Webb - Eddie Price
- Saskia Reeves - Eileen Edwards
- Jemma Redgrave - Grace Finnegan
- Adrian Bower - DC Tremayne
- Clive Merrison - Geoffrey Cramond
- Tim Pigott-Smith - Phillip Weaver
- Bill Nighy - Lockwood
- Brett Fancy - Barry Warren
- Samuel West - Tony Wainwright
- Adrian Rawlins - Tim Sumner
- Doug Allen - Lachlan
- Martin Jarvis - Cowfrey Pitt
- Rupert Procter - Simon Henshaw
- Lindsey Coulson - Hester Reed
- Abby Rakic-Platt - Nicky Warren
- Trevor Byfield - Frankie Baker
- Tom Georgeson - Michael Shand
- Matthew Goode - Peter Lynley
- Barbara Wilshere - Anna Stevens
- Robin Kermode - Tony Stevens
- Lorraine Stanley - Maggie
- Eleanor Gecks - Kelly Stevens
- Tim Wallers - Derek Tripp
- Vincent Brimble - Tania's Father
- Joanna Brookes - Edwina
- Elizabeth Kelly - Mrs. G
- Richard Syms - College Porter
- Will Knightley - Troughton
- Paul Shearer - Harry
- Miranda Raison - Ros
- June Watson - Mrs. Havers
- Selina Cadell - Glynn Weaver
- James Hillier - Adam Jenn
- Richard Lintern - Thorsson
- Lesley Vickerage - Helen Clyde
- Lesley Vickerage - Helen Lynley
- Shaun Prendergast - Sheehan
- Jonathan Firth - Rhys Davies Jones
- Julian Wadham - David Sydeham
- Idris Elba - Robert Gabriel
- James McAvoy - Gowan Ross
- Naomi Frederick - Elizabeth
- Yvonne O'Grady - Joy
- Don Gallagher - Inspector Macaskin
- Gary Cross - Sergeant Lonan
- Ron Donachie - John Ross
- Lisa Stevenson - Patsy Whateley
- Henry Cavill - Chas Quilter
- William Mannering - Clive Pritchard
- Alex Giannini - Mike Canerone
- Joe Sowerbutts - Harry Morant
- Paul Herzberg - Barry Summers
- Glen Davies - Brendan McGuire
- Mark Womack - Michael Wren
- Phoebe Thomas - Clare Simmons
- Serge Soric - Andrej Pavletic
- Abhin Galeya - Satnam Gulati
- Amy Bayliss - Sarah Pavletic
- Simon Delaney - Young Officer
- Elliott Jordan - Luke Barnes
- Geraldine Somerville - DS Michelle Tate
- Mark Anthony Brighton - Kenneth Waring
- Andrew Havill - Inspector Ardery
- Ruth Gemmell - Jeannie Waring
- William Scott-Masson - Official
- Joe Duttine - Chris Faraday
- Curtis Flowers - Jimmy Waring
- Daisy Beaumont - Amanda
- Andrew Clover - Hugh Patten
- Anjalee Patel - Hadiyyah
- Graham Theakston
- Ruth Baumgarten
Sophie Okonedo hace el papel de Eve Bowen.
Adrian Rawlins hace el papel de Tim Sumner.
Bill Nighy interpreta a Lockwood en la serie.
Anthony Higgins interpreta a James Pitchley en la serie.
Richard Lintern interpreta a Thorsson en la serie.
John Shrapnel interpreta a Sergent Mike McCaffrey en la serie.
Selina Cadell interpreta a Glynn Weaver en la serie.
Matthew Goode hace el papel de Peter Lynley.
Nathaniel Parker interpreta a Inspector Thomas Lynley en la serie.
Sharon Small hace el papel de Sergeant Barbara Havers.
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