Michael Weston

Harry Houdini

Stephen Mangan

Arthur Conan Doyle

Rebecca Liddiard

Constable Adelaide Stratton

Emily Carey

Mary Conan Doyle

Noah Jupe

Kingsley Conan Doyle

Diana Quick

Cecilia Weiss

Adam Nagaitis

Sergeant George Gudgett

Tim McInnerny

Chief Inspector Horace Merring

Jacob Blair

Benjamin Graves

Bo Martynowska

Young Woman (as Bo Martyn)

Paddy C Courtney

Mr. Gaines

Louise Delamere

Touie Doyle

Jerry-Jane Pears

Florrie

Edward Akrout

Henry

Patrick Carney Junior

Upper Class Gent

David Hoselton

David N. Titcher