Velocity

If you don’t take this note to the police . . . I will kill a lovely blond schoolteacher. . . . If you do . . . I will instead kill an elderly woman active in charity work. You have six hours to decide. The choice is yours.
 
The typewritten note under his windshield seems like just a sick joke. But in less than twenty-four hours, Billy Wiles, an ordinary, hardworking guy, is about to see his life take on the speed of a nightmare. Because a young blond schoolteacher is murdered—and now Billy has another note. And another deadline. This time he knows it’s no joke. He’s racing a killer faster than evil itself. And Billy must accept his terrifying challenge: The choice is yours.