Walking to Australia describes a 21st-century journey which roughly follows the direction taken by anatomically modern humans who, some scientists conjecture, left the African nursery around 85-thousand years ago in search of survival, and who reached Australia 20-thousand years later. The descendants of this exodus ultimately inhabited the entire world. Along this arbitrary route, the author travels in the imagined company of his autistic grandson, who serves as a confidant and also as a human archetype.