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Credit for awesome summary Attack on Titan Season 4 Wikipedia.
Eren and the Wall Titans march off to trample the rest of the world while the mindless Pure Titans created by Zeke run amok in Shiganshina. Armin, Mikasa, and Jean rally the remaining Jaegerists and cadets as Connie escapes with an unconscious Falco, whom he plans to feed to his mother to make her human again.
In the Titan-filled streets, Gabi saves Kaya from Nile's Titan, mending the rift between them. The Braus family protect her from the Survey Corps.
The Eldian soldiers, led by Jean and Shadis, lure all the pure Titans towards the castle in the center of the district, where they work together to finish off their former comrades with Armin killing the Pixis Titan.
After all the pure Titans have been killed, Armin and Mikasa meet Gabi and the Braus family. Gabi is horrified to learn of Connie's plans for Falco and pleads with Armin to convince Eren that everyone outside the island does not have to die. She mentions that the armor on Reiner's Armored Titan was stripped away at the same time as the walls were unhardened. On hearing this, Armin suspects that all Titan hardening has been undone, meaning that Annie may have been freed from her crystal.
NOTE: This episode takes place in volume 31 of the manga.