Ettie and the Midnight Pool - Julia Green

Ettie has lived blissfully with just her grandma for company and the wild woods as her playground. Until she meets the mysterious Cora and she starts to crave more - now she wants to explore further, to discover secrets of her own. So, when Cora leads her to the hidden quarry pool - deep, cold, beautiful and dangerously inviting - Ettie is ready to jump straight in. But the quarry has secrets too, and Ettie will have to dive deep into the darkness to uncover them . . .