From the DriveThruRPG item summary:
Contrapposto is a storytelling game about planning an art heist, designed to be played discreetly in an actual art museum.
3-5 players take on the roles of a team of amateur thieves hired to obtain a work of art. All players work together to identify which piece of art they’re after and plan how to steal it while balancing the team’s odd assortment of skills & hangups.
In about an hour and a half, the team will case the joint, plan their caper & try to convince each other that this will work.
And if the group can tolerate each other long enough to complete their scheme, it just might!
Contrapposto is part improv comedy and part exercise in teamwork, with a healthy respect for art & museums thrown in. Don't worry: no actual laws should be broken while playing! It's largely a fun way to visit an art museum with a group of friends.
The phases of the game are:
Introductions - We’ll draw cards that assign us aspects our characters. Then we'll go around the circle, introducing ourselves in character.
Casing the Joint - We’ll draw one shared card describing the work of art we’re meant to steal. Then we’ll move through the museum, debating which piece that card refers to.
Planning - We’ll come up with a nice, logical, easy-does-it, can’t-go-wrong plan to steal the art.
Rehearsal - When it comes to executing a heist smoothly, you can’t just wing it. We’ll need to discretely rehearse the plan without rousing any suspicion.
You in? - After the rehearsal, we’ll have a chance to vote out any Rats in the crew and try to convince each other that this will work
Aftermath - We’ll all play a Followthrough card to show what we do on the day of the heist. If we haven’t been betrayed, we’ll tally up our scores to see if we got away with it!