Surprise, surprise: the Bunker's empty when the feds get to it. Making Heidi out to be a liar. But Natasha—future Natasha—is facing worse problems. Her immunity may have saved her from the virus, but there are other, more dangerous threats out to get her.

As Heidi and Billy rot in jail, Daniel spirals into the darkest corners of his mind, and Natasha must reexamine just who she wants to be, it seems that all hope is lost for the future. The two Gradys have a plan... it just might cost everyone else their lives.

Someone other than Heidi finally pays a visit Billy ... but things do not go as planned. Meanwhile, Heidi makes a decision that could change the fate of Bunker - and the world - forever.

What's the deal with Heidi? Between her visits to Billy and spilling her deepest secret Natasha, there is something else. Where it has been in the last three months? And who was she with?

Heidi goes on a journey to do what her future self couldn't.

Heidi goes through her ​​journey to find the uncle who abused her, and must decide between revenge and justice. What she learns about himself makes her way to her friends already walks. She knows that she has to help them change the future.