JumpMan Rule #1: Don't Touch Anything

First United States edition (Simon & Schuster, 2004). Originally published by Random House Australia in 2002. In a futuristic world, kids play with a special device that allows them to be transported to any place back in time, but when the creators of the JumpMan mistakenly give an experimental device to a young contest winner named Theo, he finds himself in a real bad place when he stumbles upon a 21st-century boy asking a girl out on a date.