This book is phenomenal just like the rest of Blue Balliet's books(Chasing Vermeer and The Wright Three). Calder(one of the main characters) travels to England with his father and mysteriously disappears at the same time as an Alexander Calder sculpture. Is there a connection?? Then his two friends come to England to help look for him. After four days he is found in a rock room behind a waterfall. He is still alive but unconscious and very weak. He recovers and tells his tale of wonder. And you are probably wondering how he came to be in the rock room? Well, you will just have to read the book and find out won't you?