A serial killer is stalking the children of one-time sperm donor Wyatt Holbrook, a multibillionaire pharmaceutical developer who is dying of a rare liver disease and in desperate need of a transplant. When his acknowledged son and daughter are eliminated as suitable matches, Holbrook hires Tanner Security Solutions to track down his other offspring. The trouble is, someone else is already working his way down that same list, and Madison Connelly is the killer's next target. Things could hardly get worse for Madison: her best friend has been murdered, her identity has been stolen, she is temporarily homeless, and her ex-husband wants to sell their Internet gaming business to the Cuban Mob. But with retired Miami detective Paul Tanner as Madison's self-appointed bodyguard, things may not be so bleak after all.