A GREAT FLOOD swept much of the river town away. Whole families were lost to the river and that was sad, but sadder still, only parts of some families were swept away. Little Tilley and Ben Booh, sister and brother, get washed away when the river sweeps them over the waterfalls. It would surely have been their end except the falls were a doorway into another dimension. It is dangerous and it's not home. Torn from their family, they are driven to work as a team searching for the way back. They must grow up quickly to find the answers that lead to home but does home turn out to be what was imagined or expected? Read on!