Bettany embarks on a Mediterranean voyage, beginning at its mouth with a recently discovered mask of Medusa, identified from fragments in Gorham's Cave on Gibraltar. Charting a course east, Bettany journeys to the strategic Island of Malta, where a Punic tomb has just been discovered. She reveals contents that prove these Phoenicians originated from North Africa. In the countryside, Bettany discovers how farmers grow three citrus crops a year with a special tour of an ancient Arabic underground irrigation system called `The Invention of Summer'.