Les deux avares

Les deux avares ("The Two Misers"), is an opéra bouffon in two acts written by André Grétry at age 27 in 1770 to a French libretto by Fenouillot de Falbaire and German version by Herbert Trantow.

Martin, a speculator, and Gripon, a dodgy banker, are two greedy villains who collaborate to find treasure in the pyramid in Smyrna.

When Martin tells Gripon that there are no treasures in the pyramid, he doesn't believe him and thinks Martin tried to cheat him.

He leaves Martin locked in the pyramid.

Gripon later finds out that he has been cheated and it is he of all people who conclude that there is no honesty in the world any more.