"How do planes fly"

"How does our fridge work"

"Can I breathe underwater like a fish"

Oliver is a curious explorer, so he asks a lot of questions.

Then, one day in the bathtub, he hears a strange gurgle. "What lives down the drain" he wonders. Soon Oliver is headed down the drain in his homemade submarine on a spectacular mission. But will this clever inventor be able to discover a way back

In this imaginative and funny adventure story, Judith Rossell introduces a lovable little hero whose curiosity leads him to extraordinary places.