On Trill, Captain Burnham, Book, and Culber must pass a dangerous test to prove themselves worthy of the next clue. Adira reconnects with Gray and Saru's first day as ambassador is complicated by his engagement to T'Rina.
A fresh clue leads Captain Burnham to a dangerous expedition on the planet Trill, where familiar faces are key to finding the next piece of the puzzle. Meanwhile, Saru's attempts to navigate uncharted waters complicates his engagement to T'Rina.