There is a dark side to every passion . . . Cases of random violence have erupted across the country—murderous acts committed by previously non-violent people. Detective Adam Boedecker, grieving brother to one of the suicide–murderers, has discovered that all the suspects had taken a new breakthrough anti-depressant, Valazine. Elizabeth Barnes has devoted her heart and soul to pharmaceutical research. She's at the top of her game and slated to be awarded top honors for her latest breakthrough drug. Until a detective contacts her about a recent wave of homicides. At first, Eli dismisses it as the wild accusations of a grieving, burnt–out cop. But after another mysterious death, and some investigating of her own, Eli realizes that this intense, driven man may be the only one who can stop the killings . . . and save her from the dark side of her work.