How do planes fly

How does our fridge work

Can I breathe underwater like a fish

Oliver is an inventor, 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.