House: Season 6, Episode 18

6 - 18: Open and Shut

The diagnostics team takes on the case of a man roleplaying as a knight who collapses at the end of a duel during the Renaissance Fair, leading Foreman and Thirteen to head for the fair to investigate. Meanwhile, House learns that Wilson's newest girlfriend is his ex-wife, and tries all means to ruin the relationship in order to protect his friend from being hurt again.