P. J. Gray, psychologist and computer whiz, is feeling pretty satisfied with herself after successfully solving her first case as head of the St. Louis Police Department's Computerized Homicide Investigations Project. But she doesn't have much time to rest on her laurels: someone is using brilliantly engineered computer scams to alter hospital records, making lethal adjustments in prescribed treatments and drug dosages that have caused the deaths of two patients. Using virtual-reality computer simulations, P. J. reenacts the murders, hoping she'll find a clue to the killer's identity. Instead, she finds that a fiendish computer hacker has prepared a series of horrifying computerized "clues" to warn her of more deaths to come. P. J. and her feisty partner, Detective Leo Schultz, combine their considerable skills to mount a devious trap for the killer, who will stop at nothing to exact the revenge he's spent his entire life plotting. Kennett's gripping, thoroughly entertaining read will appeal to fans of Patricia Cornwell's Kay Scarpetta mysteries.