Stacey Castor poisons her first husband with antifreeze and gets away with it. She is only caught after killing her second husband the same way and attempting to murder her daughter and frame her for both deaths. Investigators find David Castor dead with a glass of bright green liquid nearby. His wife Stacey's fingerprints are on the glass and police locate a turkey baster in the garbage with David's DNA on the tip. They suspect Castor poisoned her husband. As evidence against her mounts, her daughter Ashley is found unconscious with a note proclaiming she killed David. Upon Ashley's recovery, Stacey is found to have poisoned both of them — and her first husband too.