The Twin Sister (If Sophie had a twin Sister AU)

(Y/N) Foster is the twin sister of Sophie foster. She's known as a crack head 'female Keefe Sencen' but what happens when Forkle could only carry two people at a time when the neverseen kidnapped her Sophie and Dex and had to leave her behind? What happens when he went back for her and it was too late? What happens when in lodestar Tam and elves raided a neverseen base only to find her bloodied and tortured? What happens when they find out she isn't the (Y/N) they all know and love anymore?
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Disclaimer I do not own the keeper of the lost cities series, they belong to the lovely author yet master torturer of cliffhangers Shannon Messenger.
Images are not mine, cover is tho and I hope you enjoy.
Spoilers will be included, tread wisely new keeper fans.