City of Endless Night - Douglas Preston, Lincoln Child

Grace Ozmian, missing daughter of a tech billionaire has been found. Most of her, anyway. Her head is still missing. Lieutenant CDS Vincent D'Agosta knows his investigation will attract fierce media scrutiny, so he's delighted when his old acquaintance FBI Special Agent A.X.L. Pendergast is assigned to the case. But neither man is prepared for what lies ahead. A diabolical presence is haunting New York City and Grace is only the first of many victims to be murdered... and decapitated. As mass hysteria sweeps the city, it will take all of Pendergast's skill and strength to unmask this most dangerous foe - let alone survive to tell the tale.