In the crime-thriller movie Knuckledust, police officers burst into an elite underground fight club and discover seven hidden levels, each filled with countless dead bodies of fighters from all over the world. Amidst the carnage, they find only one survivor, battered and bruised but still breathing. As the officers interrogate him, they are faced with a daunting task: determining whether he is a ruthless mass murderer or an unfortunate survivor of the brutal fighting tournaments. With a complex web of lies and corruption unfolding before their eyes, they must race against time to uncover the truth behind the club's sinister activities and the enigmatic figure known only as "Serena." Will they be able to separate fact from fiction and bring the perpetrators to justice, or will they become entangled in the labyrinth of deceit and violence that permeates Knuckledust?

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Some movies that have similar genres and were produced around the same time as Knuckledust include Argylle, Road House, The Beekeeper, The Hunger Games: The Ballad of Songbirds and Snakes, Expend4bles, Madame Web.