"It is Princess Harriet Hamsterbone to the rescue when Heady the hydra's egg is stolen, but her search leads her to a castle accessible only by a rat with a very long tail"--
"When Princess Harriet climbs an enormous beantalk, she finds an even bigger surprise--a giant rabbit is keeping a goose and a girl who is half-harp-half-hamster are prisoner, and it's up to Harriet to save the day"--
The last member of a line of explorers, unfailingly optimistic Pigsticks hires a hapless delivery hamster named Harold to be his companion for a quest that wends through jungles, deserts, and mountains in search of the Ends of the Earth.