A woman who has been kidnapped and sold into an underground fighting ring motivates the other captive women to lead a revolt against their captors and escape to freedom.
Anya and her brother Aslan are Russian immigrants living in London. They live a simple existence, with Anya's only companion aside from her brother being a pet parakeet that she keeps in a cage. Their parents were killed in the Second Chechen War, leaving them orphaned. Anya has been taking care of her brother ever since, working as a housekeeper while studying to be a nurse and supporting Aslan in his ill-fated career as an MMA fighter. Desperate for money, Aslan agrees to throw a fight for a wealthy businessman named Julian. However, after Anya, who was unaware of the arrangement, encourages him to fight harder, he ends up winning the match. This angers Julian, who lost 30,000 Pounds when Aslan won. After one of Julian's bodyguards attacks Aslan, Anya beats him in a fight, which impresses Julian's associate, a fight promoter named Mariah. As Aslan is a has-been that nobody wants to see, Mariah asks Anya to compete in fighting matches as an opportunity to pay back Aslan's debt. After proving that she can fight, Mariah is impressed by Anya and takes her to Rome for an MMA match. However, they are taken to an isolated villa outside the city, which makes Anya nervous. Anya quickly realizes that she has been trafficked, and when she attempts to escape, Mariah's enforcer, Janek, beats her severely and throws her into a makeshift jail filled with other trafficked women, who were also amateur fighters in need of money who were tricked by Mariah. The women, led by the ring's champion Jaya inform Anya that there is no way out except through the front door of the mansion, and that their captors have no intention of ever letting them go. The women are forced to fight each other in an illegal underground MMA ring for the entertainment of millionaires who bet on the outcome, and if they refuse to fight, they are sent to a brothel in Albania. Anya immediately begins to plot a revolt against their captors so they can escape, but the women, especially Jaya, are jaded and believe an uprising is doomed to fail. Valentina accidentally causes Mariah and Janek to learn of Anya's planned revolt, and Mariah punishes them by forcing Jaya to fight Valentina. Unwilling to be sent to Albania to be a sex slave, a despondent Valentina begs Jaya to kill her during the fight, and she reluctantly does so. Afterwards, Jaya tells Anya that she doesn't care what happens to herself now, and helps Anya lead the revolt. Janek tells the women that they will never return home, and any further attempts at rebellion will result in more punishment. Meanwhile, Aslan is concerned for his sister's safety and holds Julian at gunpoint in an attempt to force him to call Mariah and demand Anya be released. However, before he can do so, Anya uses the facility doctor's cellphone to call Aslan and tell him the location, and to send police. The women then immediately begin the revolt, killing their captors. Janek, an experienced MMA fighter himself, puts up a good fight, but the women narrowly overpower him, forcing him into a bathtub while Jaya stabs him to death with a scalpel. The women then head into the fighting room, where they attack the millionaires who are watching a fight. Some of the women die, but all of their captors are killed in the revolt. After Mariah attempts to kill Anya, she beats Mariah to death. Anya and Jaya walk past the carnage and out the front door to freedom as police sent by Aslan arrive to rescue the women. Six weeks later, Anya has recovered from her injuries and is back with Aslan in London. Inspired by her experiences, Anya opens the cage of her pet bird and lets it fly away.
