Matthew Lewis, who played Neville Longbottom in the Harry Potter films, and Ruta Gedmintas, best known for her role in TV's The Strain, are to star with Sean Campion and Niamh Cusack in the London premiere of Owen McCafferty's Unfaithful. It will begin performances August 25 prior to an official opening August 31 for a six-week run through October 8 at Found111, the pop-up venue on Charing Cross Road that has previously been home to The Dazzle and Bug.

Described as a blackly comic play, it revolves around Tom, who is enjoying a quiet pint after work. Tara lies awake whilst her boyfriend finishes his shift. When their paths cross, a chain of events is sparked that reveal the unspoken desires and regrets of two relationships on the brink.

The production is directed by Adam Penford and produced by Emily Dobbs Productions.

Campion starred in the West End and on Broadway in Stones in His Pockets, for which he was Olivier-nominated.

Cusack was in the original National Theatre cast of The Curious Incident of the Dog in the Night-time, and was most recently seen onstage in The Winter's Tale at the Sam Wanamaker Playhouse at Shakespeare's Globe.

Gedmintas has appeared in the West End in Backbeat at the Duke of York's. TV credits include The Strain (FX), The Tudors (BBC) and The Borgias (Showtime).

Lewis starred as Neville Longbottom in all of the Harry Potter films and has been seen on television in Ripper Street, Happy Valley, Bluestone 42, The Syndicate and Death in Paradise. He has appeared in the West End in Our Boys (Duchess).

To book tickets, contact the box office on 020 7478 0100 or visit found111.co.uk.