The year is Fifteen Billion and Seventy-three, and Theodore Pine Four - teenager, TimeJumper, legend - is the biggest celebrity on the Two Planets. Theo knows there's only one Rule when you TimeJump: Don't Touch Anything. That Rule applies whether you're Jumping to the Big Bang or to the day pizza was invented. But Theo's been spending a lot of time with Quincy Carter One, the Cheeo of TimeMaster Corporation. Quincy's starting to think that Rule 1 doesn't apply to him. Why not fiddle about with history? Meanwhile, back in the present, Jules Santorini and Genevieve Corrigan are too busy worrying about their first date to wonder what Theo's up to. They have no idea they're about to TimeJump three thousand years into the future, become invisible, spy on Theo, and try to save the world. But it's OK, they'll still be home on time. Can Rule 1 be broken? And if it can't, then why do we need Rule 2?