You're on a train, you're a bit bored and a stranger plonks himself next to you.

What happens? You both plan to murder members of each other's family... right?

Guy has a troublesome ex-wife, while Charles has a disapproving father.

As they hurtle along, their conversation proves fatal.

It might sound far-fetched but this Patricia Highsmith thriller, starring Colin Baker, Alex Ferns (EastEnders), Will Thorp (Casualty), and Leah Bracknell (Emmerdale) is said to have "the suspense of a Hitchcock film".

Mon-Fri 7.45pm, Sat 4pm-8pm, plus Thurs 2.30pm. Tickets £13-£22. Call 08700 606650.