Something's wrong in the House of Truth. It's Monday morning, but everyone seems so tired already. And Nian feels as if he's been eating rutnips for months - which is odd as this is the first time he's had them in ages. Still, Nian is pleased to see his brother Tan when he comes to visit - even though Tan has come to warn him about a problem between the worlds. Everything will seem easier after a good night's sleep, and Nian will think about how to solve things then. Except that when Nian wakes up, it's Monday morning again. Tan hasn't arrived yet, and there are rutnips on the menu once more... Far away in another world, an ancient monument is about to be opened up for the first time in generations. But inside the monument lurks a deadly menace that will threaten everyone around it if it is unleashed - and will even destroy the balance of the worlds. Only Nian has a chance of saving the worlds. And he'll get right on to it. In the morning, as soon as Monday's over...