Manhattan Vigil

S14 E5: In the series' landmark 300th episode, a young boy from Morningside Heights is kidnapped while in the care of his father, and the investigation reminds Captain Cragen, Sergeant Munch and Detective Benson of an unsolved kidnapping that occurred in the same neighborhood thirteen years ago. While the entire squad races against the clock to find the missing boy, Benson vows to learn from past mistakes to set both cases right.