"The blood of the covenant is thicker than the water of the womb."
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At 18 years old, Scarlette Rosewater should be worrying about what colleges to apply to, how to balance school and her social life, and boys. Instead she plans her day so that she stays out of the house as long as she can, puts up with her step-father, Scott, and most of all, keeps her younger sister, Tessa, safe. She struggles with it, and soon starts to run out of ideas, until a paper plane lands on her desk one morning. Until there's a lab accident in her Chemistry class. Until an old friend decides to win her trust back.