This is most certainly one of the best books I've read. There's pace, action and it dragged me in from the first few pages. Andrew is a mid teenaged boy who's best friends with Josh, not the best friend choices Andy could make, but he's always said, if you don't disturb the world, it won't disturb you. So Andy doesn't step in Josh's way as his anger and brutal, poor decisions including alcohol, even though they are only 15, become worse. He then realizes that he jumps to different worlds without any control over his whereabouts. The other world is exactly the same as Andy's normal world, with the exact same people, but a different, masked ruler who brutally and cruelly treats the people of the city. Josh is a ruler of a hiding gang, and his poor choices and his brutal attitude is no different, but worse, and to add to all the mayhem Andrew goes through, if he let's any of the people die in josh's gang or in the masked ruler's, the same person will die in Andy's real world, which includes his secret love obsession, Melanie, who he finds in the other world.
This book is about saving people from the ruler, especially Melanie, and also unmasking him. It says that the book is recommended for young teenagers, but I personally don't think it should be because of the mature references, language, sexual themes, and references to underaged drug and alcohol use. I would most certainly recommend this for mostly boys, but girls who enjoy a good thriller, I would recommend this to you too.
I read it within a week or two from cover to cover and loved it all. I enjoyed this book a lot and look forward to a second.