THE DEVIL YOU KNOW is a crime drama involving a middle-class black family in San Diego. Marcus is a recovering alcoholic trying to get his life back on track after prison because a man suffered a brain aneurysm several months after Marcus punched him. He’s looking forward to starting a bus driving job and hopes to redeem his life, with his family’s love and support. However, he learns that one of his three brothers may be involved with two criminals implicated in the brutal murder of two white parents. Marcus tries to do the right thing by outing the two criminals, but his efforts backfire.