Paddy Considine as Inspector Whicher

Peter Capaldi as Samuel Kent

Tom Georgeson as Superintendent Foley

William Beck as Dolly Williamson

Emma Fielding as Mary Kent

Tim Pigott-Smith as Commissioner Mayne

Kate O'Flynn as Elizabeth Gough

Donald Sumpter as Peter Edlin QC

Ben Miles as Dr. Stapleton

Alexandra Roach as Constance Kent

Jay Simpson as George Redman

Peter Gordon as Holcombe

Charlie Hiett as William Kent

Sarah Ridgeway as Sarah Cox

Ben Crompton as William Nutt

Ruairi Conaghan as Benger