A Vorkosigan book without anything more than a cameo of Miles? But this is the long-awaited Ivan book, so all will be well. Plus there is Byerly! 
 My favorite Vorkosigan books are set on Barrayar, and so this is, mostly. But it starts this book out in familiar romantic-comedy fashion when Capt. Ivan Xav Vorpatril, on a short tour of duty in Komarr, is told by ImpSec operative Byerly Vorrutyer to "pick up" the mysterious Tej who is persued by bounty hunter/assassins. One chivalrous act after another, and Ivan and Tej end up married and back on Barrayar where they have to explain things to Lady Alys. But complications start bubbling over (or is that sinking down?) in Vorbarr Sultana when Tej's fugitive Jacksonian/Cetagandan family come calling... 
 I really loved this book--so much humor, fraught moments, adventure, and romance in a few hundred pages.