It's Mari Paz, Mari Po and Mari Pepa's wedding day with their respective boyfriends Alejandro, Manolo and Leopoldo. But, at the last moment, the brides decide not to attend the wedding, considering that their mother Doña Helena does not deserve to be left alone so suddenly. Thus, they invent some of the most extravagant excuses so that the latter does not know the truth, and, secretly, they plan together with their fiancées to find their widowed mother a couple with whom to share the rest of their days. Thus, they can marry a clear conscience.