There are 10 books in the Ciaphas Cain series. The newest book is Choose Your Enemies which came out in 2019.

1
For the Emperor

Book cover of For the Emperor
Commisar Ciaphas Cain - hero of the Imperium and renowned across the sector for his bravery and valour - is sent to help maintain order on an outpost world on the borders of Tau space. But when the alien ambassador is murdered and the situation quickly spirals out of control,…
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2
Caves of Ice

Book cover of Caves of Ice
Sent to the ice world of Frigidia with his regiment of Valhallan guardsmen, Commissar Ciaphas Cain finds his quest for a peaceful life threatened by unrest among the mine workers, an invasion of orks, and a malevolent evil that is awakened deep in the ice caves of the planet. Original.

3
The Traitor's Hand

Book cover of The Traitor's Hand
By public demand, a new outrageous tale from the career of Commissar Ciaphas Cain, a man who; despite his best attempts to avoid danger and live the easy life, is constantly thrust into fame and fortune. Featuring futuristic military action, thrills and humour, The Traitor's Hand is sure to be…

4
Death or Glory

Book cover of Death or Glory
Once again, reluctant hero Commissar Cain is catapulted into glory in the fourth story of this tremendously popular series. Escaping from a disastrous space battle, the commissar and his malodorous sidekick Jurgen crash-land behind enemy lines. The only way out is to round up what few troops they can find…

5
Duty Calls

Book cover of Duty Calls
While assisting local forces quell widespread civil disorder, Commissar Cain and his regiment of Valhallans discover sinister forces are at work behind the scenes. With a rioting populace, aliens on the rampage, and the Inquisition poking their noses everywhere, how can the wily commissar ever find the easy life he…

6
Cain's Last Stand

Book cover of Cain's Last Stand
After a long and distinguished career, Commissar Cain is about to enjoy a well-deserved retirement, but when a Black Crusade threatens the sector, everyone must rise to the defence, including Cain and his cadets. Can this unlikely hero prove himself one last time?
The search for the source of the alien threat leads Ciaphas Cain to a drifting space hulk. But when the Reclamator Space Marines suffer terrible losses, Cain and his trusty aide Jurgen must go it alone. With the tyranids waking and a group of stowaway orks on the loose, Cain…

8
The Last Ditch

Book cover of The Last Ditch
Imperial commissar Ciaphas Cain returns to Nusquam Fundumentibus to crush the ork attacks which have been plaguing the frozen planet. But when his ship crashes into the wastelands outside the capital it disturbs a far greater enemy, one which has lain dormant under the permafrost since long before the Imperium…

9
The Greater Good

Book cover of The Greater Good
When the world of Quadravidia comes under attack by the insidious tau, only one man can defeat the aliens and save the planet in the Emperor's name: the legendary Hero of the Imperium, Commissar Ciaphas Cain. When the aliens call for a ceasefire, Cain expects the worst, and his fears…

10
Choose Your Enemies

Book cover of Choose Your Enemies
Commissar Ciaphas Cain returns! After putting down an uprising on a mining world, he finds evidence that the corruption might have spread to other planets, and the forge world of Ironfound could now be at risk...

It's been a long time, but the self-styled Hero of the Imperium is back…