Kat Got Your Tongue — Lee Weatherly

After a terrible car accident, Kat wakes up with no idea who she is, and no memory of anything before the crash. She doesn't even recognize her mum, much less her friends from school--Poppy, Jade, and the mysterious Tina. Only after she finds her old diary--written in a voice no longer her own--does Kat begin to discover the terrible secrets of her previous life.

This incredible novel explores the damage amnesia can do to a family, and how one girl struggles to reconcile her new personality with her old.