You’ve never seen Earth like this before: continents reshaped, oceans re-formed, cities rebuilt, and mountains sculpted anew. Dinosaurs roam the plains alongside herds of buffalo, and giant robots navigate the same waters as steam-powered ships. This is the world Diego Ribera was born into. The past, present, and future coexisting together. In New Chicago, Diego’s middle school hallways buzz with kids from all eras of history and from cultures all over the world. On his thirteenth birthday, Diego learns of a special gift he has within, a secret that is part of something much bigger—something he cannot yet understand.