During the 1920s, Beatrice Corbin just wants to keep her general store afloat and keep an eye on her younger, newly married sister, Agnes, in the small town of Azoma, Louisiana. Until, she is approached by the Devil, Frank Charbonneau, and learns that her sister will be murdered. At first, she doesn't believe Frank until one of his predictions comes true. To save her sister, she makes a bet with him, staking her soul on the wager that she can find her sister's would-be killer in seven weeks. Meanwhile Agnes is hiding her own secret, and Beatrice ignores her growing feelings for a Black blues musician, with whom Frank has also made a deal.

Unbeknownst to Beatrice, the true target is someone in her own family. As her time runs out, Beatrice becomes desperate and unknowingly pushes Agnes toward her inevitable fate. And everyone knows that the Devil doesn't play fair...but in this case, is he?