Lena and Kara have an arrangement, they are friends with benefits. It works best for them and keeps things from getting complicated. But what happens when Lena's ex comes into town and things don't seem as easy as they were before.

Clarke is forced to return to Arkadia after the death of Lexa. Meanwhile, in another reality, Clarke is getting closer to Lexa after Heda vows to protect Skaikru. Nevertheless, an unexpected visit from her future self sets her up in a race to stop the presaged death of the Commander. The only problem? This Clarke from the future has not been betrayed by Lexa. She's married to her.