The Inheritor's Powder: A Tale of Arsenic, Murder, and the New Forensic Science

I wanted to like The Inheritor's Powder, but just couldn't.  Not particularly well written, it switches between a shallow history of arsenic as a murder weapon, the confusing family history culminating in a murder, and a sprinkling of primitive forensic science.  I read it quickly, hoping it would get better.  It didn't.