Cassie Nunez has devoted her career as a research scientist to developing an implant that will suppress violent urges in sex offenders. If successful, it will be the first known mechanism to prevent these crimes. When Hurricane Amy threatens the gulf, she stows the precious cargo in her car and plows through three-foot-deep water toward safety. Greg Davidson, a private investigator, is headed to a meeting with an influential client. When rain floods the freeway, Greg is forced to swim to safety on a nearby truck.