Convincedthathisfather,whohaddisappearedintheoceantwoyearsearlier,isstillalive,the12-year-oldFelixsetsouttofindhimintheuuyuuypanyofoldTom,aretiredsailor,Quack,theone-leggedpickpocketingparrotandUlyssesthecat,whobehaveslikeadog.TheirjourneytakesthemtotheIsleofEternalNight,toanundergroundcitywhereasecretsocietyishidingledbythemegalomaniacMuuyuuyäa,holderofatreasure.