11-year-old Harry Carter creates Honc, a phone app that helps geeky kids like him talk to girls. The app becomes the next big thing and an American billionaire buys it for 10 million pounds turning the Carter family's life upside down.

To win a bet, an eccentric British inventor, beside his Chinese valet and an aspiring French artist, embarks on a trip full of adventures and dangers around the world in exactly eighty days.