Maggie lives a life of careful routines and measured pleasures. But everything changes when, walking through Gatwick a few days shy of her 58th birthday, a young woman approaches her and whispers a single word: 'Help'. Maggie responds, and in that moment saves a stranger, earning Anja her freedom and ensuring the arrest of a brutal trafficker. But when the story gets picked up by the papers, Margaret is panicked by the publicity, as well as the strange phone calls she begins to receive. Meanwhile Anja makes contact. She wants to thank her rescuer, but quickly insinuates herself into Maggie's life. As her relationship with Anja intensifies, Maggie begins to reveal, in increments, what it is she has been hiding.