This highly-charged and thrilling BBC Radio 4 dramatisation of a Patricia Highsmith novel twists an ordinary encounter between two strangers into an disquieting tale of obsession and peril. When two men meet on a train, there's nothing they fear to say. They'll never see each other again. But a misunderstanding binds them together, in word, deed and blood. The starry cast includes Anton Lesser, Michael Sheen, Saskia Reeves and Bill Nighy.