Cetaganda (Miles Vorkosigan Adventures)

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.