Books with author Mary Thelan

This is an adventure story for children ages 6-11. The story centres around Ted who lives on a narrow boat with his dog, Norman and his cat, Paul. When his father, a rock collector, mysteriously disappears, it is up to Ted and his feisty friend Serafina, to find him. At the same time he is having to deal with the school bully, Jarvis. His adventure takes him to an amazing place and he makes some fantastic, unusual, new friends on the way.