I Can See in the Dark by Karin Fossum

Riktor is a seriously disturbed loner who works as a nurse at a senior citizen home.  He delights in flushing the residents' medicines down the toilet and other far crueler acts. When the police arrest him for a crime he didn't commit, although there are others he did perpetrate, Riktor is stunned. Will he be found guilty or will the authorities find out about his other crimes? In I Can See in the Dark, Fossum delves into the mind of a social misfit who's unpredictability is frightening. The book will be published in August.