Sister Angela and Sister Mary park his van in front of a bank branch. They enter the bank and with the weapons hidden under their habits, commit the robbery of the century, to the astonishment of all employees and customers. After thorough police investigation the two nuns are arrested, but then appears Trini, twin sister of one of them and now all is not so clear. Were the nuns who committed the robbery?

Sor Angela y Sor María estacionan su furgoneta delante de una sucursal bancaria. Entran al banco y con las armas que esconden bajo sus hábitos, cometen el atraco del siglo, ante la mirada atónita de todos empleados y clientes. La minuciosa investigación policial logra detener a las dos monjas, pero aparece Trini, hermana gemela de una de ellas y ahora no todo está tan claro. ¿Fueron las monjas las que cometieron el atraco?