My Soul to Lose (Soul Screamers, #0.5) - Rachel Vincent I read this book basically for the background information on the characters and events in the Soul Screamers Series.

This book introduces you to Kaylee and Emma and their relationship. Then it gives you all kinds of detail about Kaylee's hospitalization... which helps to make sense of other stuff later on in the series.

I would recommend this book if you are reading the Soul Screamers Series.