The first season of Why Women Kill follows three women, each from a different recent era, who reside in the same mansion in Pasadena. Each storyline reaches a turning point when the woman decides murder is a justifiable course of action. The second season focuses on one storyline with Alma Fillcot, a plain jane housewife who decides to join a Garden Club, and Rita Castillo, the same woman inside who despises Alma and the series of murders that follow.