Halo Glasslands - by Karen Travis
smore by Jake Kozisek
Its characters include Dr.Halsey,Chief.Mendez,and several UNSC soldiers.
It takes place on the Covenant planet of sanghelious.
I really liked this book as it had a good story with an unpredictable change of events that keeps you reading.However I doubt that any of would read it so, it is what it is.