Depending on which show you are referring to, here are the most relevant "papers" or guides:
Entertainment Weekly provides a recap of "Mr. Kaplan: Conclusion," which centers on the "truth" Red is hiding. Other Notable S4E21 Episodes [S4E21] The Last Word
The search results for vary across different television series, and while none are titled "The Last Word," several episodes in this slot deal with themes of ultimate truths or finality. Depending on which show you are referring to,
Though technically the finale (spanning episodes 21 and 22), the season 4 conclusion involves a massive secret being revealed. Though technically the finale (spanning episodes 21 and
Season 4, Episode 21 is It features a major resignation and a high-stakes investigation.
Season 4, Episode 21 is titled While not titled "The Last Word," it is famous for Captain Picard’s concluding monologue about freedom and vigilance.