Two Graves by Douglas Preston and Lincoln Child

From Publishers Weekly: "Preston and Child's high-adrenaline 12th thriller featuring maverick FBI agent Aloysius Pendergast wraps up the trilogy that began with 2010's Fever Dream and continued with 2011's Cold Vengeance with a bang. Just as Pendergast is reunited one evening in Manhattan's Central Park with his beloved wife, Helen, who he thought died 12 years earlier, Helen falls victim to a gang of well-organized kidnappers. Despite Pendergast's impressive combination of brains and brawn as well as network of helpers, his efforts to rescue Helen don't play out as he anticipated. Meanwhile, a serial murderer dubbed the Hotel Killer has been targeting guests of Manhattan hotels, mutilating his victims and leaving behind a piece of his own body (e.g., a finger, an ear lobe) to taunt the NYPD. Given the growing cast of characters and their complex backstories, those already familiar with the bestselling authors' fictional world will most enjoy this intelligent suspense novel."