The Honeymoon Killers
Martha Beck, a lonely and overweight nurse, falls for the suave and manipulative con man Raymond Fernandez after answering a lonely hearts ad. When she discovers he's simultaneously romancing another woman, she confronts him, leading to a strange and obsessive agreement: Martha will pose as his sister, and together they will swindle money from women he seduces, with Martha often present during his intimate encounters. As their relationship deepens and their financial scams escalate, their shared pathology leads them to murder their victims, including a wealthy widow and a young mother and her infant child, as their trail of violence crisscrosses the United States, ultimately leading to their capture, trial, and execution.