John DiFool, the hapless protagonist, returns with his concrete seagull companion, Deepo for one last adventure. He has been endowed with the gift of ubiquity as he multiplies into four distinct, yet identical individuals. Each, however, assumes different personality traits, from the heroic to the duplicitous and contradictory, as they all embark on the concluding quest surrounding the mystical artifact known far and wide as the Incal.