Manipulated by a loving and jealous husband, Gloria has run away with her daughter and started a new life far away from men and from the rest of the world. Impelled by her friend, Madeleine, she agrees to meet Michel through a dating site. The first time they see each other, there is a spark. Michel, the small-time crook (profession: gigolo), is thrilled and Gloria falls deeply in love.
Out of fear, Michel runs away, but Gloria comes to find him and makes him promise never to leave her again. She is ready to do anything to salvage this love. She abandons her daughter and pretends to be Michel’s sister, so that he can continue his “widow” scams.
But jealousy drives Gloria crazy, and she eventually kills Marguerite, one of the widows. Michel is in shock, but the two lovers remain tied to each other by some powerful link. They will keep going on their sordid path. Beyond the morbid pact that unites them, Michel finds in Gloria a sort of mother figure he has always been deprived of; for Gloria, Michel is the incarnation of absolute love in a life she thought was over.
Alleluia is the free adaptation of a news item that shook the United States from 1947 to 1949; the story of Martha Beck and Raymond Fernandez, or how a young nurse and a swindler, small-time gigolo, will fall into a deadly tragedy.