This omnibus edition contains Ascendant and Gunboat, books three and four in the RMSC series.

Ascendant
A stolen enemy warship. A galaxy on the brink of war. Their deadliest undercover mission yet...
Captain Warden doesn't have much time to celebrate his promotion. Teamed up with a Royal Navy lieutenant, he's tasked with infiltrating the enemy's heavily-militarized star system. In a hijacked warship with stolen clone bodies, one wrong move could turn their mission into an execution.

In a race against time to discover the secrets of the Deathless, Captain Warden makes a bold move: kidnapping a high-ranking officer. Now with the entire enemy fleet in pursuit, the Space Marine and his Navy crew must conduct an interrogation in the midst of a battle they might not walk away from.

Can Captain Warden pull off the dangerous raid, or will his ship fall to a vicious enemy?

GunboatA space fleet in shambles. A captain facing annihilation. There's never been a better time to play dirty...
Lieutenant Commander Cohen is furious. After his admiral's questionable tactics decimate all but two of their ships, Lt. Com. Cohen needs to get back to New Bristol in a hurry. But with a damaged hyperspace function, the remaining vessels are sitting ducks for the hungry, ruthless enemy...

To repair his ship, Cohen must engage a mysterious asteroid-based faction in a trade that could make or break the war. Carrying out insurgent missions on their ally's behalf, the entire plan rests on an impeccable battle strategy and just one tiny ship.

Can Lt. Com. Cohen survive the day or will the Deathless finally get their revenge?

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The Royal Marine Space Commandos Vol 2 - pokkari, Englanti, 2019