Patrick Barlow’s adaptation of the thriller - best known as the 1935 Hitchcock movie - features four actors playing over 150 parts. Joining McCormack in the cast are Rupert Degas, Charles Edwards and Simon Gregor.

McCormack’s stage credits include an Olivier-nominated performance at the Royal National Theatre in Howard Davies’ 2001 production of All My Sons.

Charles Edwards is currently appearing with Judi Dench in Peter Hall’s current Haymarket revival of Hay Fever. At the National, Edwards also appeared in All My Sons as well as The Duchess of Malfi.

Rupert Degas’ previous London stage appearance was in Stones in His Pockets at the Duke of York's, and Simon Gregor reprises his role from the staging of The 39 Steps at West Yorkshire Playhouse last year.

The 39 Steps will be directed by Maria Aitkin, who recently helmed the acclaimed revival of Rattigan’s Man and Boy starring David Suchet. Her acting credits include Blithe Spirit and Humble Boy in the West End. Patrick Barlow is also known as Desmond Olivier Dingle, artistic director of the National Theatre of Brent, whose productions include Love Upon The Throne- the Charles and Diana Story and The Wonder of Sex, which was staged at the other National Theatre.