Vessel

Aboard the military-commercial deep space vessel, Paraclete, a murder has been committed – the ritualistic sacrifice of a young child...and the decadently wealthy Whiston family who had been charged with the boy's safety wants to know why, both quickly and discreetly.
Ray Marlowe, a deep cover security agent tasked to Paraclete to uncover a terrorist revolutionary cell, considers himself anything but discreet. But as he is inexorably drawn into the investigation, the crime is not merely heinous, it’s personal, bearing a disturbing resemblance to events he witnessed as a combat Marine on the New Mesopotamian battlefields of Earth: events too similar to be mere coincidence, and which hint at the return of an ancient and malevolent force.
Now, in a far flung future, the past has returned.