Earth to Eva
Finding your soulmate isn't an easy task. Unless you live in Thestra, a place where everyone does.
In Thestra, where people age until they're eighteen. They then meet your soulmate, whomever they may be. They may meet on accident, have known each other before the 18 year mark. However, sometime, somewhere, somehow, they will will meet them. They start aging again together, so that they will die together, but not alone.
What would happen if someone's soulmate died before they were 18? If they died, their soulmate would die too. But what if someone killed their own soulmate...
I got ideas for this book from tumblr and pinterest.