Book excerpt: Danny is a freelance IT specialist—that is, a hacker. He and his pal Omar are both skilled at parkour, or freerunning, a discipline designed to enable practitioners to travel between any two points regardless of obstacles. This is fortunate, because they're off on an adventure that's filled with obstacles, from locked doors to gangs of hostile pursuers. Together they follow a cryptic clue, find a missing map, figure out how to get to Timbuktu without buying a plane ticket, and join the life-and-death treasure hunt, exchanging wisecracks and solving the puzzle one step at a time.An exotic setting and gripping suspense, as well as an absorbing introduction to parkour, make this thriller a genuine page-turner.