There are 3 books in the Gaunt’s Ghosts series. The newest book is Necropolis which came out in 2015.

1
First and Only

Book cover of First and Only

A Warhammer 40,000 audiobook.   

In the Chaos-infested Sabbat Worlds, Imperial Commissar Gaunt must lead his men through as much in-fighting amongst rival regiments as against the forces of Chaos.   

Listen to it because: First and Only was one of the first books published by Black Library and is the most…

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2
Ghostmaker

Ghostmaker
Humanity's front-line defenders, the Imperial Guard, are aware of the risks to their bodies in defending the species, but they did not count on the damage to their souls. Reprint.

3
Necropolis

Book cover of Necropolis
For a thousand years, the Sabbat Worlds have been lost to the Imperium, claimed by the dread powers of Chaos. Now, a mighty crusade seeks to return the sector to Imperial rule. And at the forefront of that crusade are Colonel-Commissar Ibram Gaunt and the Tanith First and Only -…