This reminded me of Severance by Ling Ma. And with that, I am kinda intrigued on where is this going. I am not the biggest Scifi fan, but knowing it involves two sisters, I kinda see myself enjoying it. Especially, I always tend to love sister-dynamics. If my theories are right—or if this is heading the way I am expecting it to be, I think it might be my next favorite book for this year.