Velocity
Koontz, Dean
It sounded like some sick kid's idea of a joke. Under the windshield wiper of his car, Bill Wile had found the typewritten message: "If you don't take this note to the police and get them involved, I will kill a lovely blonde schoolteacher. If you do take this note to the police, I will instead kill an elderly woman active in charity work. You have four hours to decide." And then the beautiful blonde teacher is murdered and a new ultimatum and a new deadline appear .