Cetaganda (Bujold, Lois Mcmaster. Vorkosigan Adventure.)

Miles Vorkosigan is Back -- and in Brilliant Form! Miles and Cousin Ivan go to Cetaganda to play sprigs of the nobility at a state funeral. It was hoped they would gain diplomatic polish on this simple mission, but things don't stay simple when Miles is around, and he's soon playing detective in a strange alien culture. Miles had always wanted to save the Empire -- but the Cetagandan Empire wasn't quite what he'd had in mind....

Miles is stuck visiting Cetaganda with his doltish cousin Ivan, representing Barrayaran nobility at an Imperial funeral. Miles must have suspected that it wasn't going to be dull after the bogus docking instructions and the odd man who launched himself into their ship and started to pull a weapon on them. Three attacks and a mysterious murder later, Miles is juggling two emperors, two secret services, and a half-dozen traitors--nd that's not even counting the women.