Standing on the deck of a ferry boat, Laura Beatty watches as the assembled port and buildings of mainland Greece disappear from view. Her destination is Lesbos, but she's not only travelling across the stretch of glittering blue sea - she's also travelling 2000 years into the past, to a time when the world was a wild place of gods and warrior kings. It's here she needs to go to retrieve a forgotten philosopher, one who worked side-by-side with Aristotle to learn and to classify the world, to rely on his senses rather than myth to explain what governs the seasons and the soil, to put down on parchment the glorious multiplicity of character types he met on his travels across ancient Greece.