Robbie and his group of intrepid Lads set off to explore their river from its beginning to the end they don't believe it has. They meet many people on their travels, some friendly and others, very nasty indeed. They see new places and encounter new experiences, both wonderful and terrifying.As they travel innocently up and down the river in house boats they helped to build, no place or person they visit remains unchanged. Behind them, totally unsuspected by the Lads, nothing is ever the same again. In the wake of their boats, previously unimaginable things begin to happen and the world changes......