In the dark underbelly of Sweden, a young Romanian woman named Lidia is forced into prostitution. Desperate for revenge, she crosses paths with Ewert Grens, a seasoned police officer on the trail of a dangerous criminal. As their paths intertwine, Lidia and Grens find themselves in a treacherous game of cat and mouse, where the lines between justice and vengeance become blurred. With their fates inexorably linked, they must confront the darkness that surrounds them and confront their own demons in order to survive.

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Some TV shows that have similar genres and were produced around the same time as Box 21 include Ripley, Sugar, Black Bird, Fargo, Furia, The Responder.