A quiet, neglected girl is sent away from her dysfunctional family to live with relatives for the summer. She blossoms in their care, but in this house where there are meant to be no secrets, she discovers one.

Mairéad Farrell was shot dead by the SAS in Gibraltar in 1988 along with two other unarmed members of the IRA in one of the most controversial incidents arising from the Troubles in Northern Ireland. She had just been released from prison the year before after serving ten years for causing an explosion at an hotel near Belfast. The killing of the three provoked an international outcry and eventual enquiry. Due to her youth, her gender and her stature within the IRA, Mairéad Farrell was, unsurprisingly, quickly subsumed into the pantheon of Irish republican martyrs. But behind the mythologizing and demonisation of the time, there was also a real person, a flesh and blood young woman who was prepared to kill and die for her beliefs.