Sacrifice Their Blood (S05E09)

Robin Lee Row finds herself in dire financial straits due to her lavish spending habits. In a desperate bid for cash, she orchestrates a fire in her home, trapping her husband and children inside. Her seemingly foolproof alibi sends investigators on a wild chase, unraveling sinister secrets from her past that could ultimately reveal the truth. Meanwhile, Marybeth Tinning craves the spotlight after losing her third child to meningitis, leading her to murder her remaining eight children over time to maintain that attention. Her facade shatters when she smothers an adopted child. In another twisted tale, Cora Caro, a struggling alcoholic and con artist, seeks vengeance on her unfaithful husband by killing their three eldest sons, then attempts suicide in a botched effort.