Beatriz (Silvia Pasquel) and the Old Man (Alejandro Suárez) have been together for decades. A retired homeopathic pharmacist, the Old Man now divides his time between their Mexico City home where he shuffles around in his housecoat, raging against Beatriz, and paying secret visits to his mistress. Beatriz, when not bearing the brunt of the Old Man's tirades, sneaks out to take tango lessons - and to proposition her younger dance partner (Daniel Giménez Cacho). With their children having grown up and abandoned them long ago, the only person left to witness the aging couple's ever-escalating routine is Dinorah (Greta Cervantes), the young maid who will eventually take matters into her own hands.