DI Colette Cunningham's no nonsense approach to policing has earned her the respect of her Merseyside Police colleagues. She seems unflappable, until she gets a call from the Garda in Dublin after the body of a young woman is discovered.

After Margaret, a divorcée living in Dublin, loses her teenage son, she develops an unorthodox relationship with Joe, a homeless youth. Their tentative trust is threatened by his involvement with a violent gang and the escalation of her ex-husband's grieving rage.