Our lives are defined by other people. Some are with us from the start: parents, siblings, childhood friends. Others find us later: work colleagues, lovers. But occasionally there are people whose paths cross ours in unexpected ways - people who are destined to change our lives profoundly. One rainy afternoon two very different women meet, and through a twist of fate, Helen and Sarah become unlikely friends. This is the story of their friendship - from its traumatic beginning to its most unforeseen end.