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Cardinal Virtues

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Commander Alex Coleman is no hero. Just ask him.

It's 2037 and Alex is one more disobeyed order away from kissing his naval career goodbye. He used to be high speed, the kind of officer on the fast track to submarine command. Then he threw it all away trying to save a few civilian lives from his glory hungry commanding officer. No pain no gain, right? Alex isn't sorry he did the right thing but being everyone's favorite scapegoat isn't fun.

Now, he's marking time to retirement on Armistice Station, an underwater megastation where you can buy and do anything--except salvage a trashed Navy career. Alex is stuck doling out supplies to visiting Navy ships and chasing unruly sailors, just how he wanted to spend his last years in the good old U.S. Navy.

But things aren't quiet in Alex's underwater amusement park. France and India are expanding into the Indian Ocean and want the United States out, and Alex's eclectic band of castoff sailors are all that's in their way. Armed with nothing but creativity and coffee creamer fireballs, Alex must team up with the admiral who hates him most. Together, they must escape the jaws of a closing enemy trap set by the canny French commander who ruined his career in the first place. Can Alex outsmart her this time, or will he end up as the first POW in the next world war?

382 pages, Paperback

Published January 27, 2023

589 people are currently reading
170 people want to read

About the author

R.G. Roberts

13 books344 followers
R.G. Roberts is the author of fantasy, military science fiction, and alternate history novels and serial fiction, currently publishing on Amazon and Kindle Vella.

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5 stars
361 (57%)
4 stars
191 (30%)
3 stars
54 (8%)
2 stars
16 (2%)
1 star
8 (1%)
Displaying 1 - 29 of 29 reviews
132 reviews8 followers
July 4, 2022
I enjoyed this book. It is a little wordy in spots but has a great story. I imagine that someone who had been or is currently in the Navy would enjoy it more than I did.
Profile Image for Military Writers Society of America (MWSA).
805 reviews73 followers
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April 13, 2022
MWSA Review

R.G. Roberts is a veteran of the U.S. Navy. She served on three ships, taught at the Surface Warfare Officers School, and graduated from the U.S. Naval War College with a master’s degree in Strategic Studies & National Security, with a concentration in leadership.

In her book, Cardinal Virtues, Roberts writes about the U.S. Navy in 2037. The main character, Alex Coleman, has had the unfortunate assignment to work as XO under the command of power-seeking Admiral Kennedy. After becoming embroiled in controversy, Alex is assigned to an underwater mega-station to carry out concierge tasks while marking time until his retirement.

Alex Coleman’s wife Nancy is the commander of a naval destroyer tasked with leading a strike group through the Strait of Malacca. When a lapse of judgment causes a trigger-happy admiral to fire upon an Indian submarine, all hell breaks loose and World War III seems to be underway.
Forces of evil nations conspire to trap the Americans and destroy every one of the ships in the area.
In this technical mystery/thriller, a reader experiences vicariously what it’s like to be under relentless attack. The main characters struggle to outwit a cunning collaboration of enemies both on and under the sea. The ending will leave you wanting to pick up the next book in the series.

Review by Nancy Panko (April 2022)
Profile Image for Craig  Dombey.
6 reviews1 follower
July 10, 2025
An interesting take on the future of current alliances, war and the exploitation of the bottom of the sea.

While mining operations on the sea floor are really nothing new the idea of cities being built to support those operations on the bottom of the sea is new-ish. Private submarines, undersea roller coasters, luxury hotels and top end restaurants are all a part of this future world. Unfortunately, so are politics and national territorial ambitions.

For the most part this was an enjoyable read. Most of the characters were believable - to a point. I really hope that the prevalence of incompetent, trigger happy officers in the US Navy is the result of the author’s literary license and not a reflection of reality. In addition, the protagonist of the story, Alex, really needs to get some therapy and see a doctor. His spine tingles, his chest tightens, his stomach knots and his head hurts not just once but over and over and over again, I get it, lots of pressure and unusual circumstances but jeez he is supposed to be able to handle this stuff, he is supposed to have been trained to handle it. Guess not.

Anyway, Cardinal Virtues is worth a read.
41 reviews1 follower
July 14, 2022
Scary, Yet Exciting

I loved reading this book. Following the ups and downs of a career navy officer, dealing with incompetent senior officers who seem only concerned about themselves, not their crew and those around them in the word was difficult to take. Knowing that his hopes for his future were dashed, but also believing that he would be able to get through the problems and come up with great ways to save the whole thing made for no difficulty continuing to read, even when I had other things that needed doing.
This is a great story and I want to continue reading the next books in the series.
Profile Image for David Morris.
174 reviews1 follower
February 18, 2022
Start of a series. This one is full of people you love to hate. Set in the near future, the new thing to do is visit underwater cities.. A submarine is on patrol with a glory-hungry captain and a more laid back Executive Officer.

It is country against country as plans are made to discredit an already unpopular United States. (So what else is new.)

This has suspense and action in its entirety. Action fans and military readers should enjoy this series.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Profile Image for S. Jeyran  Main.
1,642 reviews129 followers
July 15, 2022
Cardinal Virtues is book one of the war of the submarine series. The story is set in 2037, and Alex is a navy officer that does not necessarily follow orders. The military thriller is very engaging and contains sci-fi elements keeping you intrigued.

It was interesting to see how Alex navigated through his obstacles and had to work in an environment that was not necessarily pleasing to him.

The story’s pace is steady, but the scenes are well written, enabling you to visualize what is being read.

I recommend this book to those who are into technothrillers and sea adventure readers.

587 reviews2 followers
February 11, 2023
Excellent/Interesting War Book (but not much about Subs)

This book started out with a solid 4-star rating, but grew better as the pages kept turning. The Reader might disagree with how The Author pieced everything together, and frankly — the tale seems fast at times, and extremely SLOW and unlikely at other times. But, it has more action than a normal novel, and The Reader is kept thoroughly entertained.
I will look forward to reading the subsequent books in the series.
259 reviews2 followers
August 3, 2023
Inventive plot, but not really believable.

The author glosses over a lot and expects us to accept the premise of this underwater lifestyle. Also, there are too many coincidences. The main characters are all old college chums, or married couples, or arch enemies. France has one intel officer and one submarine captain covering every task. Ditto for one American sub. That aspect is a little cartoonish.
Profile Image for Marc Rieck.
344 reviews2 followers
May 1, 2024
A wonderful novel

I bought this book because since it was set in the future, I thought it would be science fiction. I was wrong!

This novel is fascinating. It shows the range of human behaviors, from the gloryhounds, to the quiet professionalism.

The writing and the story are wonderful. The characters are amazing in their depths.

I envy you for reading it for the first time!
165 reviews
September 8, 2023
An extraordinary tale!!!

I didn't know what to expect since I heard read a book by the author before. Was I ever pleasantly surprised! The story was jam-packed with thrills & suspense. The book has an excellent plot, great characters, and a mystery or two. Kudos to Mr. Roberts. I look forward to reading your next book!
Profile Image for Eric Johnson.
Author 20 books144 followers
May 5, 2022
I liked this book a lot. It was more or less a military thriller than a military science fiction book though, where I found it on Facebook. It's got a good plot and I like how it spiraled out of control. Not that I cheer on the deaths but still worth a read.
Profile Image for Mike Mackey.
332 reviews6 followers
June 30, 2022
War Story

R.G.Roberts has Created some good and bad characters you will fall in Love with!!! His Storyline will keep you so interested, you won't want to Stop Reading it.
A Good Read!!
Santa Mike
17 reviews
January 28, 2024
Good read

At first I was concerned reading about an event in the future expecting the story to get far fetched, but was I wrong. A very plausible story and well told. I could not put it down and spent a few late nights reading.
9 reviews2 followers
February 3, 2024
Thriller

Gripping thriller that will capture your attention. You will not be able to put this book down. It seems to be a timeless book that will make you reflect on the happenings of today.
Profile Image for Paul.
577 reviews
June 29, 2022
EB: Brain candy, price was right (free). Started it because the author is a naval officer. I think the premise has been overcome by events.
Profile Image for Kendall Peterson.
Author 3 books
January 2, 2024
I was a pilot/ navigator (senior QM) on submarines. This series was very enjoyable. I spent a number of late nights reading way past My bed time.
Profile Image for Dennis E. Flynn.
137 reviews3 followers
June 18, 2024
Get's with right away

Not wasting any time getting to the action. I like the ways it shows our politicians who have no idea what military views are and visa versa
5 reviews3 followers
July 2, 2024
Ridiculous

This is the most ridiculous story line I've read in a long time. Characters are so shallow and the plot is really predictable. I'm ashamed I made it to page 51.
71 reviews
September 30, 2024
Review

Excellent story with many unexpected events that will keep you engaged and reading! Author has Naval experience that really makes it realistic.
7 reviews1 follower
October 12, 2024
Edge of seat reading.

This book has a good plot, well thought out. It was a complex plot but realistic for a future prelude to war.
11 reviews1 follower
November 5, 2024
Aoww great book

I cant wait to read more. I love story lines. Very realistic, and all possible simulations. If you love submarines and navy stories, this is it.
51 reviews1 follower
December 21, 2024
My review

This has been an interesting start to a new series. I'm looking forward to the next installment in the series.
884 reviews4 followers
April 15, 2025
A serious nail biter

The French have delusions of being aI superpower, along with India, which attacks and sinks American warships and cargo carriers
430 reviews3 followers
December 19, 2025
Great

This is a Great Book in the War off the Submarine story it took me awhile to reallly get into it., but I have already downloaded Book #2,The War nobody wanted,
Profile Image for Ayezu Tamarapreye Okoko.
610 reviews13 followers
July 12, 2023
Cardinal Virtues: A Military Thriller (War of the Submarine Book 1) by [R.G. Roberts]
R.G. Roberts
Cardinal Virtues: A Military Thriller (War of the Submarine Book 1

I looked inside the Kindle read on Amazon

A military fiction on military navy regimen and boat equipment from fueling to underwater station and use of nuclear powered weapons
Profile Image for Bob.
130 reviews4 followers
July 26, 2025
This is a wonderfully enjoyable series packed with action, naval details and engaging characters. I highly recommend it.
Displaying 1 - 29 of 29 reviews

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