Those Beyond the Wall

"English grammar can barely handle the premise: Humans from parallel worlds are jumping into other worlds, which kills their doppelgängers in the destination world, where this book takes place. Whew! (The preceding novel, The Space Between Worlds, will help make sense of it.) The wall of the title separates a high-tech, climate-controlled city from Ashtown, the home of protagonist Scales. A mechanic and member of Ashtown’s guardian gang, she tries to figure out what’s happening, amid environmental devastation and family dysfunction and generational trauma and structural inequality and institutional racism and more. Plus, motorcycles!"