No matter what, she'll find her. In this universe or the next. When her best friend Bea vanishes right in front of her, Ana Moon returns home in shock. But her house looks different. Her parents are acting strange. Something is wrong . Enter the mysterious Malik, who tells Ana that she has Fallen into a world that is not her own - one of seven versions of Earth she will have to travel through to get Bea back. Guided by Malik and his Pathfinders, Ana sets off on a journey that will force her to question everything she knows about the universe.

Lying in wait are the sinister Order, monstrous Reapers and a rogue Pathfinder bent on reaching the elusive seventh world - and who will destroy anyone who stands against them. To find Bea, Ana will have to use every skill she has learned along the way. If she fails, it won't just be her best friend that's lost forever. A fiercely paced science fiction thriller, perfect for fans of Marie Lu.