Romola Garai

as Sugar

Chris O'Dowd

as William Rackham

Amanda Hale

as Agnes Rackham

Shirley Henderson

as Mrs. Emmeline Fox

Richard E. Grant

as Dr. Curlew

Blake Ritson

as Bodley

Bertie Carvel

as Ashwell

Mark Gatiss

as Henry Rackham

Gillian Anderson

as Mrs Castaway