Paddy Considine
as Mr Whicher
Tim Pigott-Smith
as Commissioner Mayne
William Beck
as Dolly Williamson
Nancy Carroll
as Mrs Piper
Peter Capaldi
as Samuel Kent
Tom Georgeson
as Superintendent Foley
Alexandra Roach
as Constance Kent
Ben Miles
as Dr. Stapleton
Donald Sumpter
as Peter Edlin QC
Emma Fielding
as Mary Kent
Kate O'Flynn
as Elizabeth Gough
Olivia Colman
as Susan Spencer
Shaun Dingwall
as Inspector George Lock
Mark Bazeley
as Thomas Gann
Sean Baker
as Joshua Gann
Justin Edwards
as Reverend Marlow
Alistair Petrie
as Dr. Casement
Billy Postlethwaite
as Stephen Gann
John Heffernan
as Captain Charles Shore
Kate Fahy
as Georgina Shore
Laura Morgan
as Katherine Shore
Nicholas Jones
as Sir Edward Shore
Ellora Torchia
as Miss Khan / Zeenat Jabour
Helen Bradbury
as Lady Jane Coverly
Risteard Cooper
as Sir Henry Coverly
Joanna Horton
as Mrs Ruth Hallows
James Northcote
as Linus Finch
Luke Thompson
as Joshua Hallows