There are 6 books in the Chronicles of Uriel Ventris series. The newest book is The Chapter's Due which came out in 2011.

2
Warriors of Ultramar

Book cover of Warriors of Ultramar
In the cold darkness of space, the tyranids travel from world to world, consuming all in a futile attempt to slake their hunger for bio-matter. Lying directly in their path is the industrial planet Tarsis Ultra, where Captain Uriel Ventris and the Ultramarines stand shoulder to shoulder with brother Marines…

3
Dead Sky, Black Sun

Book cover of Dead Sky, Black Sun
Hard-hitting SF action with the superhuman Space Marines and Captain Uriel Ventris. Exiled from his Chapter, Uriel ventures deep into the dreaded Eye of Terror to confront the terrible foes that dwell within these worlds of insanity. Chief amongst them are the ancient Chaos Space Marine legions - twisted warriors…

4
The Killing Ground

Book cover of The Killing Ground
In the nightmare world of Warhammer 40,000, no servants of the Imperium are more dedicated than the Ultramarines, who follow the teachings of the legendary Codex Astartes to the letter. Having escaped from the Eye of Terror, Uriel Ventris and Pasanius now face an epic journey through a hostile universe…

5
Courage and Honour

Book cover of Courage and Honour
The noble Ultramarines epitomise the Space Marines, the genetically enhanced warriors who protect the Imperium from its foes. Newly returned from the Eye of Terror, Captain Uriel Ventris must redeem himself in the eyes of his battle-brothers, who fear he may have been tainted by Chaos. When the planet Pavonis…

6
The Chapter's Due

Book cover of The Chapter's Due
War is unending in the life of a Space Marine. After defeating tau forces, Captain Uriel Ventris of the Ultramarines has returned to the Chapter’s homeworld of Macragge, but there is little respite. The Ultramarines are thrust back into battle, and this time the enemy is the Chapter’s greatest nemesis.…