Wunderwaffen: The Time Traps (Wunderwaffen #12)

The Visitor has kept his promise, and the weapon called Thor is launched in time. Nevertheless, complications arise and the disaster is avoided at the heavy price of destruction in Wewelsburg. But ghosts, appearing from the past, indicate that the continuum has been compromised during the event. In Normandy, Germany won the battle, but the future seems to have been subtly and insidiously modified... As usual, the devil is always in the details...