My Secret Lies with You by Faye Bird

Three close friends... Two unforgettable summers... One girl's darkest secret... Alys appeared last summer, and then she vanished without a trace. Ifan fell in love with her. Hannah hated her. And Marko regrets what they did. This summer Cait is new in town, and a girl has been reported missing. Cait needs to uncover the truth. What happened last summer? And who is Alys?
Binding: Paperback / softback