The blood between us
(Book)

Growing up, Adrien and his sister, Grace, competed viciously for everything. It wasn't easy being the adopted sibling, but Adrien tried to get along; it was Grace who didn't want anything to do with him. When their scientist parents died in a terrible lab fire, there was nothing left to hold them together. Now, after years apart, Adrien and Grace are forced to reunite at the elite boarding school where their parents were teachers. Being back around everyone he used to know makes Adrien question the person he's become, while being back around Grace makes him feel like someone he doesn't want to be. For as much as Adrien wants to move on, someone seems determined to reopen old wounds. And when Adrien starts to suspect that Grace knows more about their parents' deaths than she let on, he realizes there are some wounds no amount of time can heal. If Adrien isn't careful, they may even kill him.