Unfolding largely in a London storage warehouse, this drama channels a love triangle involving Noel Clarke, his estranged girlfriend and her new boyfriend into a second plot isolating several characters in a confined space with a killer. Early on, a loud, off-screen bump presages both a crashed aircraft (from which something nasty has escaped) and intermittent power outages (which lock up the premises' security system, trapping people inside). An impressive if unoriginal monster is upstaged by – spoiler alert! – a cuddly toy dog with fireworks attached. The whole thing proves unexpectedly entertaining.