From the CW: “Klaus and Stefan arrive in Chicago, where Stefan is reunited with a vampire who hasn’t really moved on from her interest in him decades earlier. In a flashback to Chicago in the 1920s, Stefan comes face-to-face with a shocking chapter from his wild past. After Damon gets a tip on Stefan and Klaus’ whereabouts from an unexpected source, he and Elena follow their trail. Back in Mystic Falls, Tyler is concerned about Caroline and turns to Sheriff Forbes for help.”

This is the season of the Originals on The Vampire Diaries, and "The End of the Affair" introduced it in a big way. We met another Original (Klaus‘ little sister), found out that Stefan actually met Klaus before, and learned that Elena‘s necklace is very, very important.
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