From the publisher's website:
Journey and change.
Odyssey helps you to tell tales of ever-changing characters on remarkable journeys. This narrative-focused game from Will Hindmarch (Damnation City, Always/Never/Now) comes ready to play in numerous game worlds and ready to hack for any journey across space or through time that you can imagine. A collection of optional mechanisms helps new or experienced players cultivate just the game experience they want.
This is a GM-ful game where every player gets an opportunity to pose challenges to other players, whether the odyssey is about rollicking adventures, gritty space operatics, or a personal saga of real-world friendship.
Odyssey plays best with 3–6 players.