My Perfect Silence by Penelope Evans
At the age of four, Rose killed her baby brother. Rose can't even remember how it happened, but in the aftermath her older brother, Max, stepped in between her and a world that had changed too much. Rose needs him more than ever when, at fourteen, she stops speaking. Twenty years on and the media has fallen in love with Max, and Max has fallen in love with Caroline. When Caroline is killed, suspicion inevitably falls on Rose and she once again looks to Max for protection from the harsh world. But will that be enough? Writing from the centre of Rose's silent world, Evans creates a sibling relationship wrapped around with secrets and lies, hiding the truth behind an obsessive bond that ties brother and sister together.