Diplomatic Immunity
Lois McMaster Bujold
 Miles and Ekaterin are enjoying a much-delayed honeymoon while their first two children are approaching birth in their uterine replicators back on Barrayar. They have just left Earth to begin the journey home when Miles is dispatched by Gregor to Graf Station in Quaddiespace to untangle a diplomatic incident in his capacity as the nearest Imperial Auditor. There, he is unexpectedly reunited with the Betan hermaphrodite Bel Thorne, a former Dendarii captain and his good friend. A convoy of merchant ships and their Navy escorts are prevented from leaving the station, and a Barrayaran officer is missing, either murdered or deserted. While investigating, Miles uncovers a plot by a high-ranked Cetagandan to steal a cargo of extreme importance to the Cetagandans and hide its tracks by putting the blame on Barrayar. By the time Miles figures out what is going on, he and Bel have been infected by a highly lethal Cetagandan bioweapon. Miles almost dies (again) and barely averts an interstellar war between Cetaganda and Barrayar.