Diplomatic Immunity by Lois McMaster Bujold (American, 2002)

Summary:
The tale begins with a diplomatic incident that involves a Komarran Trade Fleet that was impounded in Quaddiespace. Komarr is one of the planets of the Barrayar Empire; a military-oriented planet, so the merchant fleet needed to be escorted by Barrayaran military. The Quaddies, on the other hand, are a neutral race that has a different ideology regarding genetic mutation than the Barrayarans. 
  One of the military escorts, Lt. Soilant, dissappears with only a puddle of his blood to be found, which triggers an intergalactic incident with the Barrayarans that needs to be sorted out by an Imperial Auditor: Miles Vorkosigan. 
  Miles agrees to cut short his honeymoon and go with his wife Ekaterin to solve the dissapearance of Lt. Soilant. 
  When investigating, Miles discovers that the fleet, which was originally thought to be carrying mammal fetuses, was actually carrying babies under the care of Ker Dubauer. He also discovers that an amphibian named Russo Gupta was trying to kill Dubauer. 
  Later it is revealed that Gupta, was trying to stop Dubauer because it had hijacked the shipment of babies, and murdered everyone on board with a bioweapon, to create a new Cetagandan empire (the Cetagandan Empire is an enemy of the Barrayar Empire). 
  Miles Vorkosigan ended its plot and returned the babies to their families.
  Dubauer then contaminates Miles and Bel (a friend of Miles) with the bioweapon and threatens to kill the rest of the crew and leave a biobomb in Quaddiespace. Miles manages to apprehend Dubauer and to lead the Quaddies to find and defuse the biobomb. This results in the Quaddies letting the fleet go and Miles returning the babies to their families.
  After Miles solves the emergency, and the incident is over, he and his wife return home to welcome their own babies.

Another summary:
The book narrates the story of Miles Vorkosigan, an Imperial Auditor who travels in space along with his wife and is called to solve a diplomatic incident in a space station. Miles works for the Emperor of Barrayar, Gregor Vorbarra, and is sent to investigate an incident at Graf Station. The case was about a disagreement between a Komarran fleet and Barrayarans officers: an officer, Lieutenant Solian, disappeared leaving a pool of blood behind in the Komarran fleet. At first the blood had been proved to belong to Lieutenant Solian; however, after digging more in the case, Miles and his team found that the blood had been fabricated. As the investigation continues they discover that the apparent “accident” was actually a plan of a renegade Cetagandan ba, a type of citizen from the Cetegandan Empire. The purpose of the plan was to incriminate Barrayars in the theft the important fleet, containing Cetagandan babies; that would initiate a war between both Empires. Fortunately, Miles and his allies stop the operation and give back the fleet with the cargo, preventing the war. Although Miles gets injured in the process, he finally gets to go back home with his wife to meet his newborns.

Another summary:
Right when Miles Vorkosigan and his wife Ekaterine are about to return from their honeymoon to get home and attend in time to the birth of their first children (conceived through the system of uterine replicators that frees babies from any possible genetic difficulty), the problems for the Barrayar empire begin. This originates in the Graf Station located in Quiddiespace, where a commercial fleet from Komarran is confiscated and its escorts are arrested along with it. 
It is the responsibility of the Imperial Auditor to listen to the versions of events from the points of view of all the witnesses and involved in order to clarify this embroilment and cause the least possible damage to the empire, which gets complicated when every person involved in it has a very different version of what happened. Plus, as a result of this conflict, it is also necessary to investigate the disappearance of Lieutenant Solian. To make matters worse, new problems with Cetaganda are in sight and it does not look like trouble has a near end.  
During the investigation, Miles finds some clues that could either lead to the truth or make the situation more difficult. In addition, as the story advances, new characters join Miles in this quest for truth and others oppose him in order to fulfill their own goals. The desperation of the Barrayaran army to recover its fleet and its compatriots are potential threats against the mission. 
As the investigation progresses, the evidence becomes a trap, the attacks to Miles' team do not wait, and the passengers, who are still arrested, need answers about their status as detainees. Thus, surprises like the traffic of fetuses start to come out. After a meeting with a smuggler who reveals important information for his investigation, Miles is committed to saving one of his companions from death and capturing the culprit of the problem, who are both in the same place. Besides, now he has to take extreme care of himself since his own life is also in danger. 
Miles manages to reach the place where his targets are and, together with Roic, one of the men of his team, arrests the responsible and ends the conflict of his compatriots detained and the trafficking of fetuses. This results in the liberation of the confiscated fleet and the fulfillment of the main request that the emperor had made to Miles: to avoid the circumstances leading to a conflict with Cetaganda again, which could have ended in a war between civilizations. 
In the end, things seem to have resulted well for everyone. War is prevented, the fetuses are rescued, Miles and the people who helped him in his mission are recognized for it, and, most importantly for Miles, he and his wife Ekaterine are able to return home in time for the birth of their firstborns. So the adventure ends for Miles Vorkosigan, one in which racial and civilizational differences are the drive of the story.

World view: Describes in a variety of aspects and with some consistency an imaginary state or society which is regarded as better, in some respects at least, than the one in which its author lives.
Future projections: The perfectibility of mankind through science and technology is presented as desirable.
Ideology: Portrays the enforcement of justice in a positive manner and has faith in human capacity to build a better future.
Characters, plot and writing style: A perfectly planned social order derives on the personal satisfaction and psychic well-being of the characters.
Classification: Dystopia