The setting is Carmel, California—a scenic, peaceful tourist haven where James Dewitt is the police force's only detective. His usual caseload is stolen bicycles and an occasional burglary, but things change with frightening speed when a series of apparent suicides, which soon prove to be murders, shocks the community. Dewitt, a former forensic scientist, struggles with the minutest of clues in his quest for the killer, while departmental turf wars and local politics increase the pressures on his investigation. His steps are further dogged by renegade ex-cop Howard Lumbrowski, the man Dewitt blames for his wife's death. How is Lumbrowski connected to the killings? And why does he have information from Dewitt's confidential files? Dewitt finds himself playing a dangerous game, breaking his own rules in a desperate search for answers.

Police Sergeant Lou Boldt heads a special task force within Seattle’s Homicide bureau. His job: find and stop the Cross Killer, a twisted, perverse serial murderer who has eluded police for six months and paralyzed the city. But when a body washes up on the shore of Puget Sound, Boldt thinks the killer has finally made a mistake. This body shows some of the work of the Cross Killer—but a job badly botched. Did this woman die while trying to escape? Did she knowingly jump in the water to preserve a clue? And is she now desperately trying to tell Boldt something? With the help of the alluring Daphne Matthews, a police psychologist, Boldt pieces together the complex puzzle. Undercurrents is a roller-coaster ride in the dark that will intrigue, startle, and satisfy.

Agent Andy Clayton has been inactive for eighteen months, kept under tight surveillance at his home in Washington D.C. Now he is needed—Leonid Borikowski, code name Dragonfly, has been seen entering the U.S., and Clayton is the only man who may be able to find and stop him. For Clayton, it is much more than a routine assignment. He knows Dragonfly, has faced him before, and he wants him. His interest is as personal as it is professional: He wants revenge on the foreign agent who killed Duncan Clayton, his twin brother. But there is much that Clayton doesn't know. He doesn't know that Borikowski is carrying perhaps the most important, and dangerous, biological discovery the world has ever known. He doesn't know that the microbe is in a suitcase armed with a device that will explode if Borikowski is harmed. And he doesn't know about the Soviet intelligence project code-named Bookends—a project that will not be complete until Andy meets the same fate as his brother. The ensuing chase takes him across the United States and Canada, putting himself, the woman he loves, and thousands of innocent people in jeopardy.