In a dystopian Detroit, grand houses that once housed the wealthy are now homes of the city's most-dangerous criminals, surrounded by a 40ft containment wall to keep the rest of the city safe. Undercover cop Damien Collier is sent undercover to free Lino, an ex-con with ties to notorious gangster Tremaine, and together they must stop a plot to destroy the city unless a ransom is paid. As they navigate the treacherous landscape of Brick Mansions, Damien uncovers corruption and deceit that goes all the way to the top, leading to a thrilling showdown against the masterminds behind the plot.