An ex-special forces operative wages a one man war through the streets of Amsterdam to rescue his friend's daughter from the local crime syndicate.

In the fourth installment of the fighting franchise, Boyka is shooting for the big leagues when an accidental death in the ring makes him question everything he stands for. When he finds out the wife of the man he accidentally killed is in trouble, Boyka offers to fight in a series of impossible battles to free her from a life of servitude

After a series of calamities in Washington D.C., two estranged brothers re-unite and decide to investigate the cause of the nature's unexpected attacks. Will they be able to unravel the mystery?