The Boy Who Set Sail on a Questionable Quest(2008)
(The third book in the Blart series)
A novel by Dominic Barker
Blart lives on a pig farm with his grandfather and doesn't care about being heroic or legendary, but he reluctantly embarks on an epic quest to save the world accompanied by a feisty princess who likes dragons, a warrior who's a big softie and a disaffected dwarf.
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Used availability for Dominic Barker's The Boy Who Set Sail on a Questionable Quest
April 2008 : UK Paperback
January 2013 : Canada, UK Kindle edition