The Commonwealth, book 2: Juda unchained
Peter F. Hamilton2005

It is around the year AD2400 and a war between humans and Gaens is raging over many starsystems. Against this backdrop, Captain Wilson Kime confides to Paula Myo, chief investigator at the Intersolar Serious Crimes Directorate, his belief that humans are being manipulated. With the help of the one creature she can trust, Qatux, a Raiel, Paula Myo's team set out on an investigation to discover the unknown entity responsible for corrupting the humans, which leads to a race against time as both humans and Gaen hurry to deploy their new doomsday weapons.