David Carroll 
Sight Unseen [EPUB ebook] 

What would it feel like to know you are going blind?Thirteen-year-old Finn loves bike riding – the more dangerous the trail, the better. But he had a spectacular crash a few months ago, and he’s just received a diagnosis that will change his life. He is slowly going blind. In a few years his vision will be gone.Desperate to salvage something of his "last" summer, Finn invites a friend to the cottage and is drawn to a strange island that seems to glimmer – but no one else can see it. When he gets close, he’s sucked into something he could never have anticipated. Can Finn’s friend Cheese help him come to terms with "lights out" . . . or will it take something much more extraordinary?