This is one of the best Star Trek novels that I ever read!
GREAT STORIES NOT ALWAYS HAVE A NICE ENDING
This book is positioned in a solid 5th place, in my very personal top list of Star Trek novels that I have read, and I still can't imagine something able to make it to lose its high position.
Sadly, it's very likely that a lot of Trekkers and sci-fi fans haven't read it.
Since it's part of the event The Captain's Table (a book event where Star Trek Captains go to a certain kinda-mystical bar and the price for the drink is to tell a story), I think that some people didn't read it or they prefer to read the adventures of the most known captains (the ones from the TV series (since Calhoun is a captain only appearing in prose novels (and in some comic books)) and due those other stories weren't that good (at least in my opinion), when readers would reached this book, they have lost the interest, will and/or confidence to keep reading more novels of this event.
I can understand that, since I was quite dissapointed myself with the book event (in an overall sense).
BUT...
...I had already bought the novel, so I told myself: "What the heck, let's read it".
One of the best decisions in books that I ever done.
This novel is easily the best one, more ambitious and far superior than the rest of the ones included in the book event of Captain's Table (at least the ones that I have read, since later they published another one and a further anthology (that I want to give them a try in the future)).
It's a strong Star Trek book, with a priceless non-traditional ending, but also I think that it's a gripping novel in the general literary sense.
THE UNTOLD TALE OF MACKENZIE CALHOUN
Mackenzie Calhoun suffered a downfall, early in his Starfleet career...
Now it's the moment to know what happened...
While it would be advisable to have have read first at least the first 4 books of the book series of Star Trek: New Frontier, since in there, you will know who is who in the series, where Captain Mackenzie Calhoun is introduced along with his crew.
Due the narrative, in this novel, is a tale from Mackenzie Calhoun's past, set several years ago, I believe that any reader, they will be able to enjoy the story quite the same, founding there all the elements and comments that they need to understand the development of this particular story.
You will find there, the harsh consequences of "real life" as real as you would be able to get in a futuristic sci-fi book where not always you have a happy ending, a book so different that, you will find that things aren't as you usually expected in your typical Star Trek novel.
Also, as a bonus moment, when Calhoun gets at first, into the mystical and mysterious bar, he will meet a captain of the past, one with another sad story quite well known.
If you are looking for a dark story with strong and believable characters, this is your novel.
This is a stand-alone novel, so you can easily skip the previous novels of this book event, since they aren't particularly good (and besides they are stand-alone stories too), and "jump" ahead to give a chance to this book.
In my humble opinion and honest hope, I believe that you won't regret to read this novel.