Adam Stone è cresciuto nella polverosa e arida città di Blackwater, circondata dal deserto, un luogo fuori dal mondo dove nessuno può dirsi veramente libero. Non desidera altro che fuggire da quella prigione e trovare un'esistenza di libertà e di pace. Ma c'è qualcosa che Adam rincorre ancor più della libertà: l'amore dell'affascinante Sadie Blood.
Blackwater. A dustbowl town on the edge of a poisoned desert. A place where life is cheap and death comes easy. Adam Stone wants a new life. He wants freedom and peace and a chance to escape Blackwater. Most of all he wants the beautiful Sadie Blood. To earn that new life, Adam will risk everything. Alongside Sadie and the enigmatic outsider Kane, Adam will ride the Blackwater Trail - a brutal race that will test them all body and soul. Only the strongest will survive.
Ana Moon's best friend, Bea, has vanished. Her house has changed. Her parents have become strangers. She has fallen into a world that is not her own. Guided by the mysterious Malik and his Pathfinders, Ana must travel across seven versions of Earth to get Bea back. Lying in wait are the sinister Order, monstrous Reapers and a rogue Pathfinder bent on finding the elusive seventh world, and who will destroy anyone who stands against them. To save Bea, Ana must master her own Pathfinder powers, or it won't only be her friend who is lost forever - it will be Ana herself.