The Little Baron Trump is a man of adventure. He and his dog Bulger have already braved many adventures together, but at the time our story opens, they are kind of dull at home, upset with the increasing familiarity of both two- and four legged neighbours. What to do? Luckily, an old manuscript of the learned Spaniard, Don Constantino Bartolomeo Strepholofidgeguaneriusfum, falls into his hands, and off he goes to a journey to the centre of the earth.