Nothing really happens in this movie, but with Bogart's charisma and the ridiculous quartet of Robert Morely, Peter Lorre, Ivor Bernard, and Marco Tulli...BEAT THE DEVIL is a lot of fun.  I think they were all trying to figure out how to stake claim to an African Uranium deposit while stranded in Italy, but the movie is about how clueless brilliant people can be, how anxious being stranded can make people, and how interchangable love and marriage can be.  No grand scheme lke other Bogart movies; just simple, enjoyable, light-heartedness.