Seventeen-year-old Laz Hayerian wakes up on an abandoned Earth to discover that he and his companion Ivy Downey are clones, and they must work together--combining their talents to sense and step into and out of timestreams--to save humanity from imminent extinction. Laz is a side-stepper: he has the power to jump his consciousness to alternate versions of himself in parallel worlds. This time he wakes up in a cloning facility on a seemingly abandoned...