What happens when your sister disappears, and then returns, changed in ways trauma alone can't explain?

Sutton going missing is the worst thing that could have happened to Casey, to their family. She’s trying to help find her sister, but Casey is furious. She knows Sutton is manipulative, yet everyone paints a picture of her perfection. People don’t go looking for missing
Black girls—or half-Black girls—without believing there is an angel to be saved.

When Sutton reappears, Casey knows she should be relieved. Except Sutton isn’t the same. She remembers nothing about the time she was gone—or anything from her old life, including how she made Casey miserable. There’s something unsettling about the way
she always wants to hang out with Casey and watch her goldfish swim for hours.

What happened to Sutton? The more Casey starts uncovering her sister’s secrets, the more questions she has. Did she really know her sister? Why is no one talking about the other girls who have gone missing in their area? And what will it take to uncover the truth?