An unnamed U.S. military operatives, referred to as “the Mother” (Jennifer Lopez), orchestrates an arms smuggling deal that entangles her with both ex-SAS Captain Adrian Lovell (Joseph Fiennes) and arms dealer Hector Álvarez (Gael García Bernal). Their relationship soon becomes complex when she finds herself pregnant. When she uncovers their involvement in child trafficking, the Mother decides to become an informant for the FBI.

During an interrogation at a safe house, things take a dire turn when FBI Special Agent William Cruise (Omari Hardwick) is ambushed by Lovell. After a violent confrontation, where Cruise is injured and several agents are killed, the Mother saves his life by constructing a time-delayed bomb. A fierce battle ensues, leading to her being stabbed by Lovell just before the explosion helps her escape. Following this chaos, she gives birth to a premature daughter in the hospital.

SAIC Eleanor Williams (Edie Falco) delivers the chilling news that Lovell’s body has gone missing and that their newborn daughter, Zoe (Lucy Paez), will be placed with a foster family for her protection. Eleanor stresses the danger of Lovell finding out about Zoe, raising the stakes even higher. With a grim past marked by back-to-back tours in Iraq and Afghanistan, and after confirming 46 kills, the Mother understands that she cannot provide a safe life for her child. Ultimately, she reluctantly relinquishes her parental rights, setting conditions for Cruise regarding Zoe’s upbringing; she desires an ordinary life for her daughter, annual birthday photos, and to be contacted in case of danger.

Years pass, and the Mother disappears into solitude in an Alaska cabin for twelve years until Cruise reaches out to her with alarming news: during an ATF operation, they discovered evidence pointing to Zoe’s potential danger. While surveilling Zoe at a park, she is kidnapped by Álvarez’s men. The Mother skillfully fights back, managing to take down several of the kidnappers before fleeing with Cruise. While he believes the abduction is about ransom, she understands it as a calculated move to draw her out. The leading kidnapper, known as Tarantula (Jesse Garcia), becomes a key target in their search for Zoe.

Venturing to Havana, Cuba, they capture Tarantula, who reveals that Zoe is being held at Álvarez’s operations on a place called “the Plantation.” Tarantula warns of the unspeakable horrors that await Zoe, leaving little hope for negotiation. Fueled by desperation and vengeance, the Mother extracts information through brutal means, ultimately killing Tarantula after a torturous interrogation.

In a moment of revelation, the Mother confides in Cruise that her connection with Lovell runs deep; he had been training her sniper unit in Afghanistan, giving rise to their relationship and further entangling her with both men. She admits that she first encountered Álvarez while on a tour at Guantanamo Bay, which led to their horrific partnership in trafficking children.

With renewed vigor, the Mother infiltrates Álvarez’s compound and successfully rescues Zoe, confronting Álvarez in a climactic battle. Though he questions if Zoe is his child, the Mother firmly asserts that it is irrelevant. As they return home, Zoe begins to recognize her biological mother through the lens of the Mother’s fierce maternal instincts. However, the plan to return Zoe to her foster family is thwarted when Lovell intervenes, resulting in a fatal confrontation with Cruise.

In a desperate attempt to keep Zoe safe, the Mother retreats again to her secluded cabin, even contacting Zoe’s foster parents to reassure them. Over time, she shoulders the burden of teaching Zoe vital survival skills, igniting both frustration and resilience within her. After a minor accident in the wilderness leads to a hospital visit, Zoe’s slip of information alarms the Mother, prompting a hurried decision to leave her with Jons (Paul Raci), a trusted former military friend.

Feeling abandoned yet again, Zoe’s anger shifts when she discovers a letter from the Mother, expressing her unwavering love and the sacrifices made for her safety. With newfound determination, Zoe returns to the cabin to assist her mother, preparing for the impending showdown. As Lovell’s men approach their hideout, the Mother employs cunning strategies, laying mines around the cabin for protection.

In a harrowing final battle, while the cabin is destroyed, Zoe’s bravery emerges as she assists her mother in confronting Lovell. Amidst the chaos, Zoe proves her mettle by shooting Lovell, indicating she embraces the dark legacy of her mother. In the end, as tragedy strikes and Lovell is killed by the Mother, peace is briefly restored, allowing her to return Zoe to her adoptive family. As the story concludes, she chooses to remain a watchful guardian, ensuring her daughter’s safety from a distance as the cycle of violence finally seems to end.