When Phoebe and her disabled husband, Martyn, move into a new house in a quiet village, they plan to lead a quiet existence, to keep themselves to themselves. It's safer that way. But their new neighbour Anna is bored of spending her days alone. She seeks friendship with Phoebe - even though she knows there is something strange about the new couple. What is Phoebe hiding and why are she and her husband so reclusive? Phoebe makes it clear to Anna that she doesn't want her friendship, that it's safer for Anna to stay away. Haunted by her past, Phoebe fears that Anna's arrival in her life may prove to be the catalyst for her undoing. Then Anna gets caught in a storm and is thrown into the river. As the waters rise, she is rescued by Phoebe...and that's when the truth about her new friend surfaces with deadly results.