Ensign Probus (The Space Merchants Series, #8)

Just when Princess Teagan and her husbands had decided to have no more secrets, lies, or prevarications between them, the Galaxic Government has other ideas, and it leaves some of them on opposite sides.

After being brought to the cusp of interstellar war, the Parvac Empire participates in a deadly race to uncover the source of technology far too advanced to have been created within the known galaxies. The discovery would put a government or criminal faction at a major militaristic advantage...