Cassidy Red is a western romance set against the backdrop of the 19th century American southwest. The film follows the headstrong daughter of a prostitute who returns to her hometown, seeking vengeance against the corrupt lawman she believes murdered her lover.

Kate attends her estranged sister's bachelorette party at the request of their dying father. The weekend, held at a remote cabin booked on a home sharing app, turns into a savage life-or-death struggle that pits family against family, and past against present.