Two Graves (Special Agent Pendergast Series #12)

For twelve years, he believed she died in an accident. Then, he was told she'd been murdered. Now, FBI Special Agent Aloysius Pendergast discovers that his beloved wife Helen is alive. But their reunion is cut short when Helen is brazenly abducted before his eyes. And Pendergast is forced to embark on a furious cross-country chase to rescue her.
But all this turns out to be mere prologue to a far larger plot: one that unleashes a chillingly-almost supernaturally-adept serial killer …