Five years after the events in Salt Lake City, a now 19-year-old Ellie makes a discovery while on patrol with her best friend Dina. Back in Jackson Hole, Joel seeks help to mend his relationship with Ellie.

As a storm brews in the mountains, the people of Jackson Hole prepare for the worst amid increased sightings of Infected. Meanwhile, Abby weighs her options.

After Dina shares crucial information, Ellie prepares to petition the town council, even while she struggles with her deep emotional scars. On the outskirts of Seattle, a religious sect attempts to flee a war – raising questions on what lies ahead.

In 2018, Seattle FEDRA confronts an unexpected foe. Ten years later, Ellie and Dina find themselves in the middle of a bloody battle between the zealous Seraphites and a ruthless militia.

The WLF makes a dangerous discovery... at a great cost. Later, Ellie must decide whether to continue with her plan – and risk putting Dina in danger – or give up on her quest for justice.

Joel surprises Ellie for her birthday. As their rift continues to widen, Ellie prepares for a confrontation, while Joel makes a difficult choice out on patrol.