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I assume you're talking about the one in the Other World encounters deck. "The Story Continues" in the analogous card in the Mythos deck. The purpose of those cards is to shuffle their respective decks. That way you're not guaranteed to see every card, and some cards you might see more than once during the game.
Ah, ok. We only shuffled the not-yet-looked-at cards, as this was not specifically (to my feeble mind) quoted. Thx.