Grace wakes up with amnesia and meets a young girl who takes her back to a compound.

16 years have passed and she realizes that she's missed out on everyone's lives.

Everyone has moved on and the girl who saved her, Athena, is her daughter.

We jump to the present and a heavily pregnant Grace is being saved by Morgan.

Morgan is trying to get away from Riley and the others, but they are pursued into an old abandoned garage.

Back in the future, Athena, Grace, and Morgan get closer but they realize a danger lurks in the darkness of the compound.

In the end, Morgan delivers the baby, and Grace is heartbroken to realize her child will never live to be the person she thought she would be.

Teddy and the others now have both keys, leading to questions about what it means for everyone going forward.