In 2003, eight young Rhode Islanders created a secret apartment in a hidden space inside the Providence Place Mall and lived in it for four years, filming everything along the way. They snuck in furniture, tapped into the mall's electricity, and even secretly constructed a brick wall with a locking door, smuggling in over 2 tons of cinderblock. Far more than just a wild prank, the secret apartment became a deeply meaningful place for all its inhabitants - a personal expression of defiance against local gentrification, a boundary-pushing work of public/private art, a clubhouse to coordinate their artistic charity, and finally, a 750 square foot space that sticks it to the man.

Christian Wolff (Ben Affleck) has a talent for solving complex problems. When an old acquaintance is murdered, leaving behind a cryptic message to “find the accountant,” Wolff is compelled to solve the case. Realizing more extreme measures are necessary, Wolff recruits his estranged and highly lethal brother, Brax (Jon Bernthal), to help. In partnership with U.S. Treasury Deputy Director Marybeth Medina (Cynthia Addai-Robinson), they uncover a deadly conspiracy, becoming targets of a ruthless network of killers who will stop at nothing to keep their secrets buried.