Set against the politically charged backdrop of 1980s Guatemala, Mexico 86 follows Margaret, a fearless and principled activist played by Bérénice Bejo, who is forced to flee her home after her husband is kidnapped by the regime. Seeking refuge in Mexico City, she leaves behind her young son, embarking on a dangerous mission to expose the atrocities of the dictatorship to the international community. Driven by a fierce maternal love and an unyielding commitment to justice, Margaret navigates a shadowy world of underground resistance, espionage, and moral compromise. Years later, the consequences of her sacrifice come crashing back when she must confront her now-grown son, forcing a raw and painful reckoning with the past. Blending the tense atmosphere of a political thriller with a deeply personal family drama, the film explores the impossible choices demanded by revolution and the heavy price of conviction.