Good Book: Thr3e by Ted Dekker

"Kevin Parson is alone in his car when his cell phone rings. A man calling himself Slater offers a deadly ultimatum: You have exactly three minutes to confess your sin to the world. Refuse, and the car you're driving will blow sky hight. Then the phone goes dead.
Kevin panics. Who would make such a demand? What sin? Yet not sure what else to do, Kevin swerves into the parking lot and runs from his car. Just in case.
Precisely three minutes later, a massive explosion sets his world on a collision course with madness. And that's only the first move in this deadly game."

Three riddles. The first, three minutes. The second, thirty. The third, sixty. No cops. One bomb on bus 3, Third street.

Thr3e