Eidolon — Sofi Croft

Paul is in trouble - moved from a young offenders' prison to a hospital for the mentally ill because he sees and talks to his dead sister. He knows she's real. And she has something important to say. The doctors' methods are painful and disturbing. As the treatments build up, Paul is increasingly confused about what is real and who he can trust. But he is not the only patient - not the only one who hears voices that seem connected to strange and inexplicable powers. When some of his friends are transferred to the mysterious Ty Eidolon, Paul becomes suspicious that they are destined for a sinister fate. As his grip on reality weakens, Paul must make a decision - whether to escape alone or help the others escape with him into an uncertain and dangerous future.