Elementary: Season 5, Episode 5

5 - 5: To Catch a Predator Predator

Holmes and Watson have plenty of suspects when they investigate the murder of a man who led a secret life as a vigilante, "catfishing" sexual predators on dating sites and publicly shaming them. Also, when Shinwell's criminal record prevents him from finding a full-time job, Holmes disagrees with Watson's plan to help him.