Tracers by J.J. Howard

An action-packed romance—now a major motion picture starring Taylor Lautner
Cam is a New York City bike messenger with no family and some dangerous debts. While on his route one day, he runs into a beautiful stranger named Nikki—but she quickly disappears. When he sees her again around town, he realizes that she lives within the intense world of parkour: an underground group of teens who have turned New York City into their own personal playground—running, jumping, seemingly flying through the city like an urban obstacle course.
Cam becomes fascinated with Nikki and falls in with the group, who offer him the chance to make some extra money. But Nikki is dating their brazen leader, and when the stakes become life-or-death, Cam is torn between following his heart and sacrificing everything to pay off his debts.

In the vein of great box-office blockbusters, the high-stakes romance here sizzles within this page-turning thriller that will leave readers feeling like they are flying through the streets of New York.