There are 12 books in the Fourth Fleet Irregulars series. The newest book is Marfik which came out in 2025.

1
Mission Zero

Book cover of Mission Zero
Skipper Alex von Strada is one of the Fleet’s highest achieving officers, commanding the corvette Minnow with a company of eccentric officers and last-chance crew sent to him for rehab. The updated 2nd Edition includes the free first chapter of Fourth Fleet Irregulars Book 2: Karadon.

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2
Karadon

Book cover of Karadon

Skipper Alex von Strada has a new ship and a new mission. His task is to clean up the infamous deep space station ISiS Karadon. ISiS Corps Director Belassa Torres is determined to defend the station's independence. Caught between them, manager Chokran Dayfield will find his sanity and even his…

3
XD-317

Book cover of XD-317
"The committee has planned a task series for you, Alex..." With an alien aristocrat joining the crew, the Fourth Fleet Irregulars embark on a mission that will take them beyond the League's borders - and beyond their wildest dreams.

4
Dark Running

Book cover of Dark Running
Penetrating deep within Marfikian territory, the Fourth seeks out the legendary world of Samart. Their task: to make contact and establish the basis for an alliance. The problem: the Samartians have responded to every previous effort to contact them with four incomprehensible words and a barrage of missiles. Can the…

5
Sector Seventeen

Book cover of Sector Seventeen
For centuries, there have been glimpses of something very strange and very fast in the turbulent space beyond Telathor, known to spacers as the Space Monster of Sector Seventeen. Now the Fourth is sent to investigate the Phenomenon under orders never to use the M word - nobody, after all,…

6
Carrearranis

Book cover of Carrearranis
The Fourth has found the mysterious long-lost colony of Carrearranis. Their task: to land on the planet and acquire the advanced technology which could protect their own worlds. The problem: the planet is protected by a ten thousand year old Guardian, the mythical Space Monster of Sector Seventeen. Alex will…

7
Quarus

Book cover of Quarus
Across the Galactic Gulf lies Quarus, a world so strange that decades of human diplomatic effort have failed. With the quarians about to close their borders, there is one last hope to save the relationship: Alex von Strada and the Fourth Fleet Irregulars. This is a mission which will take…

8
Assegai

Book cover of Assegai
“A change is as good as a rest, Alex…” While the Fourth is celebrating the success of the Quarus mission, Captain Alex von Strada is seconded for a five month mission aboard the Fleet’s newest and finest destroyer. But while Alex is enjoying adventures on the Assegai, his professional and…

9
Venturi

Book cover of Venturi
The Fourth Fleet Irregulars have a new ship; the Venturi. Their mission - to make contact with the mysterious Chethari, the alien only Alex von Strada can see. Transported to a strange world far beyond the realms of human exploration, the Fourth must draw on all their resources and courage…

10
Libris Cartash

Book cover of Libris Cartash
‘It’s been ages since they let us blow anything up.’A year ago, the Fourth Fleet Irregulars were taken to a distant planet they found was the legendary Libris Cartash, the Lost Library of Cartasay. There, they discovered a mysterious crystalline artefact buried deep underground, which they were unable to reach…

11
Cherque

Book cover of Cherque

The system of Cherque has lived under siege for eight centuries.

Any ship wanting to go to or from Cherque must traverse around the tumultuous storms of the Cherqui Ranges. The only problem? Any ship taking that route risks coming under attack from the ruthless, cyborg Marfikians. Cherque itself is…

12
Marfik

Book cover of Marfik
The Fourth Fleet Irregulars are the people you send for when an extraordinary problem needs an extraordinary solution.

The Fourth has the most advanced ship in space, the most highly qualified crew in the Fleet and powerful alien friends. They also have fun, revelling in the joy of exploration and…