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Credit for awesome summary Attack on Titan Season 4 Wikipedia.
Zeke tells Levi that five years earlier on Marley's orders, his spinal fluid was released in a gaseous form towards the Ragako villagers on Paradis. He says it initially paralyzed them and then he turned them into Titans with his scream. Zeke claims he did it to maintain his cover. Levi accuses him of not truly caring for the people he killed.
During Nicolo's dinner for the Braus family, Gabi and Falco tell him that Marley is preparing for an assault on the island. Nicolo deduces that Gabi killed Sasha and attempts to bludgeon her with a bottle, but Falco takes the hit instead.
The Survey Corps arrive and restrain Nicolo while Mikasa saves Gabi from Kaya who attempts to kill her. Gabi is escorted to another room by Mikasa and Armin while Nicolo tells Hange to rinse Falco's mouth as he suspects that the wine Falco accidently ingested is infused with Zeke's spinal fluid. Nicolo explains that the wine came from Yelena's scout ship and was given to him by her to be served to the high government officials.
Levi receives word of Zachary's death and wonders if he completely miscalculated Eren's potential as humanity's savior. The Jaegerists raid the restaurant and hold everyone at gunpoint. Floch demands Zeke's location from Hange and reveals that he knew about Zeke's plan with the wine.
Eren meets with Mikasa, Armin, and Gabi and states that he wants to talk.
NOTE: This episode is partly from Volume 27 and from the beginning of Volume 28 of the manga.