María and Manuel have a plan, or rather two: spend New Year's at the house of Manuel's sister and her partner, and take the opportunity to ask them for a very delicate favor.
The Last Tango takes place hours before Violeta's performance with Carlos Gardel; replaced by her friend Lucecita, she locks up her ex-partner Julio to disguise herself as him and be able to dance with Lucecita in front of the singer.