Superb episode.

When the men helping to build wind turbines in New Bern are returned early, but Eric isn't with them, Jake and Hawkins go exploring and discover that the mayor of New Bern is planning a war against Jericho and he's telling lies to the population in order to gain support.
He using a factory to make ammunition and when Eric and Heather found out, Eric was imprisoned and Heather was killed.

This was a real thriller of an episode with the main storyline as detailed above increasing the tension again and again.

A minor storyline showed that Gail and Johnston have difference ways to dealing with April's death, Eric's absence and with Mary.

Skylar tries to be emancipated so she is free to do with the salt mine as she pleases. Mayor Gray doesn't agree with that.