A courtroom. A divorce. A drama told in flashback. In a courtroom story, the viewer will witness the divorce of Clemente and Emília, in which the division of property and custody of a child are discussed. But something strange slowly begins to emerge in the testimonies: from the clash between the two versions of the same couple's experience, the truth will come to light.

Driven by rebellion against a government that condemns them to oblivion, a group of university students decide to take their future into their own hands by devising a daring plan: to kidnap a secretary of state, forcing her to expose the dark truths of power. But what begins as an idealistic gesture quickly fragments into a web of tensions and secrets. When unexpected violence results in a brutal death, the group faces the weight of an impossible decision: take responsibility for what they have done or stage a lie to escape the consequences. As the hours pass, the boundaries between reason and madness begin to disappear, the masks fall, and each is forced to undergo a profound transformation—a mutation that will shape them forever. "Mutation" is a psychological and visceral thriller that explores the darkest corners of human consciousness, in a mesmerizing journey where justice, fear, and survival collide in a spectacle of tension and strangeness.