The penultimate clue to the "progenitor tech" leads Discovery to a pre-warp, pre-industrial world called Halem'no, where the denizens speak via voice *and* a form of "whistlespeak." Michael and Tilly go undercover as Halemnians and have to run a race up a mountain to gain access to a temple where the fifth clue may be hidden! In a classic Trek turn of events, the race's reward is not exactly what it seems and the clue is not exactly where it seems -- and, briefly, all hell breaks loose.
Meanwhile, on the ship, Dr. Culber is experiencing a spiritual awakening and an emotionally remediated Commander Rayner does an "ok" job of helping Adira overcome their self-confidence issues. Also, Book plays pong‽
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