Twilight returns to Luna and Celestia's old Castle to transport the books in it to Canterlot. Finding them missing she triggers a New booby-trap and is nearly killed. Only to be saved by a strange gray stallion, who vanishes right after. Twilight then decides to search out this strange pony and figure out who he is. And he is the Ninja of Equestria; Twister Slash!

Authors note: this takes place after "Castle Mania" in the timeline. the only change in events is that when Twilight and the other girls rescued Luna and Celestia from Discord's vines; they took the elements from the tree of harmony after they where safe and the mysterious box never appeared