The prosecutor - Julia Valenciano. Young, ambitious and facing a case that could launch her career. The defendant - David Marquette. A successful Miami surgeon and devoted family man. The victims - Marquette's own wife and three small children. The plea - Not Guilty by Reason of Insanity. The perfect father and model husband, David Marquette seemingly just snapped. His experienced defence team claims paranoid delusions caused by schizophrenia drove him to slaughter his entire family. But the state suspects Marquette's insanity defence is being fabricated to disguise murders that were cold-blooded and calculated. Worse, Julia believes Marquette could be responsible for a string of unsolved, brutal homicides.The distraught survivor could just be one of the most prolific and elusive serial killers in the country's history. To bring him to justice, Julia must embark on a terrifying personal journey back into her own past - something she has struggled for fifteen years to forget. And this will lead her to confront a future so chilling, she's not sure she will ever be able to face it... Plea of Insanity confirms Jilliane Hoffman as a major thriller-writing talent at the peak of her powers.