A bedsit. A young woman in trouble. A park. A missing teenager - and parents searching for answers. Struggling to cope with the disappearance of their teenage daughter, Tom and Gill's marriage is left in tatters. In an attempt to numb his pain, Tom makes a decision that has an irrecoverable and unexpected impact on their lives and the lives of those closest to them. Spiral explores the human need to cling to another person, no matter what the cost. What happens when trust breaks down? Can other people save us? Or must we save ourselves?