HOLLOW BONES by Anneka Freeman
Underneath fifteen-year-old Robin’s apparently normal life lurks a bizarre secret. Robin is a shapeshifter who can take any shape: male or female, human or animal, or a mix of all. Robin’s adopted family are the only ones who know and the terror of discovery looms constantly.
Then Robin starts sprouting scales in the middle of a history exam. Something is very, very wrong. The list of symptoms grows daily. Though Robin is worried about people finding out, the danger of dying is more terrifying still. In the hope of finding other shapeshifters, Robin decides to risk everything.