In Too Deep by Brenda Manson
Nora had always lived a life consumed by the shadows, engulfed to the point where she felt her life would end. It wasn't until her baby sister, Emerson was born that she felt true love. Emerson gave Nora's life hope and meaning once again. Nora would do anything to keep Emerson safe. With an alcoholic and incompetent mother, Janet, Nora was tasked with raising Emerson; and had never known any support from anyone else.
It was a dusky, somber evening when Janet brought home a very dark, brooding stranger. This stranger reeked of something dank and foul, and seemed to be more interested in Emerson than Janet! Nora is faced with no other decision than to protect her sister at all costs. Janet refuses to believe the desperate plea of her daughter's regarding her new husband. She blames Nora when the accusations come to light.
When the police get involved, Nora learns that she has acquired a support system of her own. Nora reaches back into the darkness that she knew before Emerson; and discovers a reality that she never anticipated... one which will broaden Nora's experiences beyond her wildest fantasies... as well as her darkest nightmares! Nora embraces the darkness with both willing anticipation and fear...