Ever since Martin Banks and his fellow computer geeks discovered that reality is just a computer program to be happily hacked, they've been jaunting back and forth through time, posing as medieval wizards and having the epic adventures that other nerds can only dream of having. But even in their wildest fantasies, they never expected to end up at the mercy of the former apprentice whom they sent to prison for gross misuse of magic and all-around evil behavior.

When you discover the world is a computer program, and you figure out that by altering the code you can time travel and perform acts that seem like magic, what can possibly go wrong? Pretty much everything. Just ask Brit, who has jumped around in time with such abandon that she has to coexist with multiple versions of herself. Now, Brit the Elder finds that her memories don't match Brit the Younger's.

Mattie and Brewster are normal, typical 16-year-old twins who live with their normal, boring parents: Martin and Gwen Banks. Normal and boring, that is, until the day their father's best friend shows up at their house - dressed in what appears to be a bathrobe. The next thing Mattie and Brewster know, their parents are frozen like human statues in their living room, the guy in the bathrobe has vanished, and they need to find answers - fast.   

A month has passed since Martin helped to defeat the evil programmer Jimmy, and things couldn't be going better. Except for his love life, that is. Feeling distant and lost, Gwen has journeyed to Atlantis, a tolerant and benevolent kingdom governed by the Sorceresses, and a place known to be a safe haven to all female time-travelers.

It's a simple story. Boy finds proof that reality is a computer program. Boy uses program to manipulate time and space. Boy gets in trouble. Boy flees back in time to Medieval England to live as a wizard while he tries to think of a way to fix things. Boy gets in more trouble. Oh, and boy meets girl at some point.