Admiral Terral orders Captain Lorca to withdraw from Pahvo. Lorca, however, does not want to leave the planet with its peaceful civilization unprotected. He orders a course to Starbase 46 at Warp 5, rather than using the spore drive, to give his crew the opportunity to devise a method to detect the cloaked Klingon "Ship of the Dead". Saru, Burnham and Tyler propose to beam aboard the Klingon ship to install transmitters. When the ship is cloaked, the transmitters would send the position to the Discovery, allowing to relate these data to imperfections of the cloak. In order to get the Klingons to drop their cloak, the Discovery would act as a bait. Lorca asks Stamets to perform as many as 133 microjumps around the Klingon ship, in order to get the required 3D data. Stamets is reluctant but eventually agrees when Lorca demonstrates that he is interested in more than only the military side of Stamets's research, and that it could be used to explore parallel universes. Lorca does not want Burnham to beam over to the Klingon ship with Tyler, but Burnham reminds him of his own words that she is only aboard Discovery to help end the war. The Discovery jumps to Pahvo, right as the Klingon "Ship of the Dead" has arrived. Kol orders to decloak in order to be able to attack, whereupon Tyler and Burnham beam aboard, masked by pattern simulators that let them appear as Klingons. They place one transmitter near the ship's stern but then discover a human lifesign in the burial chamber. It is Admiral Cornwell. While Burnham tends to the admiral, Tyler discovers someone he knows: It is L'Rell, who was dumped here by Kol. Memories of his torture resurface in his mind, and he is unable to act. Burnham stuns L'Rell and proceeds to the bridge alone to place the second transmitter. Once she has activated the device, the Discovery jumps away. The Klingon vessel goes to cloak again, giving the Discovery crew the opportunity to perform the microjumps and to gather the data necessary to detect the cloaked vessel. Kol's people, however, discover the sabotage to the ship. In order to gain time, Burnham gives up her cover, reveals her identity as the one who killed T'Kuvma and challenges Kol to a fight. After the completion of the scan, the three Starfleet officers are beamed out of the Klingon vessel, but also a Klingon prisoner, L'Rell. The algorithm to detect the cloaked vessel is put together, and Lorca orders to fire photon torpedoes, destroying the defenseless "Ship of the Dead". Apparently plagued by his PTSD, Tyler goes to the brig to see L'Rell, who insinuates that the two have a common plan. Lorca promises that Stamets would have to perform just one last jump, to get the Discovery out of the range of the Klingons. But this jump goes awry. Stamets collapses, and the ship ends up in unknown territory, surrounded by Klingon wreckage.

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