After spending her childhood in care, Eva is desperate to find her birth parents and to get some closure on her difficult past. And so she finishes her relationship with boyfriend Gareth, leaves her home in London, and heads to Whitby in search of the family she has never known. But Eva's close friend, Celia is worried. Eva has stopped answering her calls and when Celia travels to London to speak to her she realises Eva has moved without telling anyone. Both women have been badly damaged by their childhoods, and Celia makes the decision to follow Eva to Whitby, concerned that Eva is unravelling... Gareth, furious that Eva ended things the way she did also decides to go in search of his missing girlfriend. But it is the start of a lethal situation. But who exactly is Eva and why is Celia so concerned about her friend? Some relationships are toxic. Others are deadly.