Evil Genius by Catherine Jinks

In the book Cadel just found out that his father (evil dude trying to take over the world) is actually not his father but just some crazy genius dude in prison. Cadel is now trying to run away from the people of Axis and his real father. The cops have now found him and are taking him to to the station so he does not get discovered by Axis people. There is this one guy named Vadi who is part amphibian and part human, he has webbed fingers and toes, the coolest thing is he has gills.