Round Behind the Ice-House — Anne Fine

Cass has always been there for Tom, her twin - racing off to laugh with him in the old, abandoned ice house or planning how to foil Jamieson, the farm's creepy pest-killer. But now Cass is a teenager, she is changing - she wants her privacy and feels suffocated by their life on the farm. Bewildered, Tom struggles to regain their former closeness, but only succeeds in alienating both Cass and Jamieson's daughter Lisa. Until the night of the storm . . .