What happens when two people die at the exact same time? They're bonded, landing in the same place between the world of the living and the world of the dead. Caught halfway through, Sage Tinsley and Cinder Cadwell meet in a place called the 'In-Between.' But instead of sorting out their past and moving on like most Crossers (People who die and move through the In Between to the world of the dead), Sage and Cinder find themselves stuck between life and death, trapped in the strange and dangerous land between these two worlds with only each other to rely on.