Right before Christmas, Shelby Hart is visited by the man who ditched her at the altar. It seems he wants the expensive gifts he'd given her to give to his new fiancé. Unfortunately for him, Shelby sold them. When the man shows up dead in a bed of poinsettias, Shelby is thrust reluctantly into a group of women who call themselves the Second Mistress Club. Convinced that one of them killed the philandering man, Shelby sets out to find a killer and gets a Christmas surprise.