When Becky and her mum move to the tiny village of Oakbridge, Mum is hoping for a new beginning. But when Becky discovers an old photo of her mum in hospital clutching a baby, twelve years before Becky was born, Becky becomes haunted by the thought that her mum is keeping something from her.

Stifled by her mum's over-protectiveness and depressive moods, Becky feels alone. The only place she finds comfort is at the local Butterfly Garden with her new friend, the wild-spirited and impulsive Rosa May. But Becky can't shake off some unanswered questions. As the two girls spend more time together however, Rosa May's unpredictable temper and possessive streak suggests that she is hiding something as well...