In the humdrum town of Moormouth, Walter Mortinson's unusual inventions cause nothing but trouble. After one of his contraptions throws the town into chaos, Walter's mother demands he cut the nonsense and join the family mortuary business.

Far off on Flaster Isle, famed inventor Horace Flasterborn plans to take Walter under his wing, just as he did Walter's genius father decades ago. When a letter arrives by unusual means offering Walter an apprenticeship, it isn't long before Walter decides to flee Moormouth to meet his destiny.

Walter runs away in the family hearse along with Cordelia, the moody girl next door with one eye and plenty of secrets. Together they journey through a strange landscape of fish-people, giantess miners, and hypnotized honeybees in an adventure that will not only reveal the truth about Walter's past, but direct his future.