Eva Ibbotson

Hal is lonely and knows that a dog would become his companion and best friend. His adventure begins when his wealthy parents return a rented pup leaving Hal with only one option: running away. The adventure involves a poor but worthy friend, valiant dogs, and a series of improbably but engaging events that culminate happily.

The secret Island is perfect — with one exception. It’s missing its prince, who was stolen years before as a baby. Now a hag named Odge Gribble, an old wizard, and other memorable characters have set off on a quest to London to rescue the child and reunite him with his parents.