A smug celebrity author (Conleth Hill) falls victim to a deranged stalker (Stephen Graham) in this intriguing chiller.

Hill oozes self-regard as the writer, a puffed-up TV pundit and lecturer still living off the renown and wealth bestowed on him by his sole novel, published 25 years earlier.

Graham is simultaneously creepy and pitiful as a lonely security guard who discovers Hill’s habit of thrill-seeking shoplifting and blackmails him into a weirdly uneasy friendship.

Set in Northern Ireland, this low-budget thriller sometimes strains credulity, but the stars’ performances keep us gripped.