Dr. Elizabeth Barnes has devoted her heart and soul to medical research . . . at the expense of love in her life. But now--winning an award for her latest breakthrough drug--Elizabeth is at the top of her game, and she wouldn't change a thing.

Until a detective contacts her about a recent wave of homicides.

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 Elizabeth's new anti-depressant, Valazine. First, she dismisses it as the wild accusations of a burnt-out cop. But after another mysterious death, Elizabeth 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, her passion, her life.