Brighton, 1974: Mark, a trendy, young university lecturer, finds himself at a crossroads. His current lover and former student Justine seems to be growing restive, and he desperately casts around for a way of holding onto her. Constantly short of money and envious of his contemporaries' greater earning power, he wonders whether an answer lies with his wife's wealthy, irritating, but conveniently ageing parents. Based on a re-working of the notorious Arthur John Waite case in New York in the early twentieth century and updated to the 1970s, Murderer: On Your Mark combines a gripping thriller with an acute, unwavering portrait of an intelligent, apparently decent man whose greed and innate sense of superiority allow him to take a turn towards a sociopathic villainy.