The Last Mercenary (2021) Plot Summary & Ending Explained

Richard Brumére is a covert agent working for the government, and his life takes a dramatic turn during one of his operations when he inadvertently gets his friend Jouard's ex-wife pregnant. This leads to the birth of a son, Archibald al Mahmoud. In a twist of fate, his wife demands that her child receive two vital things: government-provided financial support and a caretaker. Consequently, an agent named Fernand is assigned to look after Archibald, and over the years, the boy grows up believing that Fernand is his actual father, never having met Richard.

Unbeknownst to Archibald, trouble brews when Ministre Sivardière uncovers a fraudulent employee facilitating payments to Archibald. The situation escalates as Archibald becomes entangled in serious allegations, classified as a terrorist involved in arms and drug trafficking. With the government's withdrawal of funds, Archibald loses his immunity, prompting agents to hunt him down.

As agents storm his home, tragedy strikes: Fernand suffers a heart attack caused by the Big Mac, a nefarious device that disrupts his pacemaker. In the chaos, Archibald tries to escape but ends up in custody, where he is interrogated—unfortunately, he passes out during the questioning. Learning of his son’s predicament, Richard springs into action to rescue him, adopting the alias George to shield his identity.

During a gruesome fight with law enforcement officers, Richard successfully liberates Archibald but hides the truth of their relationship. Their getaway includes abducting the willing Sivardière, who becomes entangled in their escape, which ultimately leads to a painful revelation for Archibald. Feeling betrayed, he grapples with the truth of his father’s actions.

As Richard recalls the precious moments with his late wife, twirling her pendant, the narrative takes an emotional turn. Archibald suddenly recognizes the man who comforted him during the funeral, realizing that he was never left behind. With the recovery of the Big Mac device, Jouard ultimately decides that Richard must still face the consequences of his earlier operation, Cup-and-Ball. In a final act to aid his escape, Richard activates the Big Mac, plunging the entire building into darkness, vowing to always be there for his son, despite the tumultuous circumstances surrounding their lives.

In the end, Richard Brumère, aka The Mist, manages to uncover the truth behind the imposter threatening his son and the secret weapon, Big Mac. It turns out that the real mastermind was Marguerite, a former secret agent and Richard’s friend, who orchestrated the entire scheme to secure a future for her son, Paul Leseur. Once the scheme is exposed, Marguerite and Paul are arrested by the police, but Richard cleverly escapes using the Big Mac—a mysterious weapon—leaving the authorities behind. The film concludes with Richard disappearing into the shadows, emphasizing his role as a free agent who operates outside the law.

In a post-credits scene, a new mercenary receives a coded message about a threat from the "goose out of the freezer," hinting at the return of more enemies or unresolved threats. This suggests that the cycle of danger continues, leaving the story open for future adventures. Additionally, in a humorous touch, the film shows Richard delivering a baby at the end, symbolizing his ongoing involvement in his family’s life, even if in an unconventional way. Overall, the ending stays true to the film’s comedic and action-packed style, blending surprises with a sense of ongoing chaos and unresolved conflicts.