Cerah

Shortly before the fall of their empire, the Thalshuk created a prototype of an intelligent weapon called Paragon, which they thought would bring them ultimate victory in an ongoing war.

Disgruntled with her career and future prospects in Temporal Security, Cerah and her best friend Peter find themselves caught up in an unusual mystery when the time ship they're serving on is sent to investigate a change in human history that leads them to discover a member of the Thalshuk race millennia after their extinction. Following a murder on board their ship, coupled with unexplained appearances of more Thalshuk at different points in history, it soon becomes apparent that a powerful enemy is searching for the Paragon weapon, with the intention of using it against Earth.