Imagine if, right now, clattering underneath your feet was a secret train system that could take you anywhere in minutes. Imagine a trip full of mystery and excitement from New York to Barcelona to the wind-swept coast of Italy to the edge of space. Imagine dangerous strangers, amazing friends, and high adventure. Imagine Mytro. This book is about kids who find an amazing underground train system that spans the globe and holds great power. The first in a trilogy by the former editor of Gizmodo.