It’s the countdown to Christmas and Sal Kilkenny is exhausted even thinking about the festive season - after all with one small but demanding daughter, the life of a single mum is pretty hectic at the best of times. So when she is asked to investigate a suicide that a grieving family cannot come to terms with, she turns the case down. Eventually, against her better judgement, she is persuaded to look into the woman’s last hours and is ashamed to realise how little the authorities investigated. Why would a woman so petrified of heights choose to jump from the top of Manchester’s Arndale Centre car park?