Pale, cold, relentless, they will do anything to coax Mam back to Witches Borough. When they kidnap Mup's dad, Mup and her mam must leave the mundane world to rescue him. But Mam is strange on this side of the border - striding, powerful, and distant. Even if they can save Dad, Mup is not sure anything will ever be the same again...

    Because the machine, code named Belch, is doing their homework for them, they start spending a lot of time together, attracting a lot of attention. And attention is exactly what you don't want when you are keeping a secret. Before long, members of the D Squad, as they are called at school are getting strange Instant Messages from a shady guy named Milner; their teacher, Miss Rasmussen, is calling private meetings with each of them and giving them pop tests that they are failing; and someone has leaked the possibility of a homework machine to the school newspaper. Just when the D Squad thinks things can't get any more out of control, Belch becomes much more powerful than they ever imagined. Soon the kids are in a race against their own creation, and the loser could end up in jail...or worse!