Ale and her best friend Rubén, witness the brief sighting of a comet. She hangs on to the moment.

A unique relationship between two women that transcends time and space.

Spain, 1937. Ramón Mercader, a young communist combatant, is recruited and trained by the Soviet intelligence service to participate in a top secret mission ordered by the ruthless dictator Joseph Stalin: the assassination of his former political rival, Leon Trotsky, who is living in exile in Mexico.

Seeking refuge from a broken marriage, Pilar returns to her childhood home by the sea, only to find it buried beneath shifting dunes. Amid the ruins, she meets Luis and Miguel, two strangers whose paths intertwine with hers. Together, they embark on a transformative journey, uncovering the meaning of love, loss, and the resilience to shape their futures.