Mercy Kill by Aaron Allston

This book features a return of the Wraith Squadron with many familiar characters and some new (or almost-new) ones as well. The story has a nice balance of spying adventure with some character growth--the scars of the Yuhzohng Vong war are obviously still healing slowly. The audio was particularly nice because there were a lot of sound effects and music to go along with the reading. Basically a very nice adventure that can stand on its own.