Babylon 5 Series / To Dream in the City of Sorrows / Kathryn M. Drennan

Ambassador to the alien world of Minbar, former Babylon 5 commander, Jeffrey Sinclair, is one of the first to learn the truth about the Shadows, the ancient race pursuing the destruction of the galaxy. Sinclair also discovers a startling secret: he is the linchpin in the legendary Minbari warrior group, the Rangers. But it may cost him his one chance to love… and his life.
To Dream in the City of Sorrows

Catherine Sakai, commercial pilot and planetary surveyor, has lost her heart to Jeffrey Sinclair. Not even an attack by the Shadows can stop her from getting to Minbar to join him… and the Rangers. As she trains with other pilots, including the mysterious Marcus Cole, the time is coming when their skills will be tested on their first mission. Led by Sinclair, they will venture into deepest space, into a battle of stealth and might, and toward a fate none but the bravest can face… and none but the luckiest will survive…