[s5e5] Cradle | To Grave

The "interesting story" you're referring to is likely the episode " Cradle to Grave " (Season 5, Episode 5), which is widely considered one of the series' most disturbing and memorable "unsub" (unknown subject) cases.

You can watch the full episode on platforms like Apple TV or Philo . [S5E5] Cradle to Grave

In a tense climax, JJ and Prentiss lead the charge into the Reinman home to rescue the surviving women and babies. The "interesting story" you're referring to is likely