I was very pleasantly surprised by this one! While I do think more could have been done on the Kennedy angle (and the author, David Bishop, agrees with me there in his afterword), I was riveted to this outsider's view of the events of early Third Doctor Era.
Now, I had been worried going in because I knew from references made elsewhere that First Doctor companion's post-Doctor life as shown in this book was TERRIBLE. And I'm a huge companion stan. I love all of them and, aside from the ones who died on screen, I always watch them leave the TARDIS in the hope that they live a great life, being the Doctor for whatever time and place they end up. That...did not happen for Dodo in this timeline of events, and I had thought my foreknowledge of that would dampen my enjoyment of this story. But it didn't. Reading how the relationship between main character Stevens and Dodo grows throughout the second act of this three part story is a beautiful thing and Dodo's ending is meant to be tragic, especially because we know that she never remembered anything about the Doctor, who is obviously one of the most important people she ever met in her life. And we see that the Doctor never forgot about her, showing up for her funeral in what (in my opinion, based on the description) was his second incarnation, and still talking to Stevens in his third incarnation about his friendship with her all those years before. While her death could very easily have felt like a plot point to drive home the epic manpain of the main character, it doesn't ever fall into that pitfall.
And if you read this book and Bishop's version of her endgame, you can always comfort yourself with the thought that DW novel canon is very lax and every viewer picks and chooses what happened for themselves and it can be true until the visual canon of the show states otherwise.
I must say that what drew me in to this story -- even aside from the brilliant hook of the prologue -- is the premise of a journalist writing a government/military conspiracy tell-all book. Back in early 2021, I started writing the history of DW through the lens of, if UNIT and Torchwood were real agencies, what would conspiracy subReddits have to say about them and the mysterious individuals all called the Doctor. And so I wrote a script for the webseries Buzzfeed Unsolved to talk about these "conspiracies" with some comedy mixed in. (I only got through Web of Fear, The Invasion, and Spearhead from Space in chapter one. And I really should get back to working on that because it was a lot of fun to write the dynamic of the BFU hosts...but comedy is hard to write. I do hope to get back to it soon though cos I have a lot of material to work through and I always love the excuse to rewatch classic Who episodes). This book is a lot like that fanfic I was writing, just with the comedy removed.
And man, from the outside, UNIT does look VERY shady. I wouldn't be as quick to assume that a group connected with the United Nations was the bad guy in all of these events, but that there was a lot of weird, questionable activity? Yeah. I can buy a journalist looking askance as our beloved Brigadier on some of these things.
I will say though that if you're not familiar with Third Doctor Era, you may want to give this one a pass until you've seen at least a bit of it because it would be easy to get lost. There is a lot of what Bishop called "fandom wank" in his afterword. (The meaning of that word has changed a bit over the years and now usually refers to group infighting in the fandom, i.e. wanker, but in the early 2000s when he was writing his postscript, it referred to grabbing at various fan lore references and shoehorning them in so that fans could "wank" over it.) There are name drops of various one-off characters from future plot lines post-Third Doctor Era, less talked about companions, and stories from the Virgin New Adventures novels and BBV videos. This is very much a book for the die hard fans of the classic series and not meant for newbies looking to get a deeper idea of who the Doctor is. (Honestly, the Doctor is barely in this and while he is important, it is very much a Doctor-lite story. If you watch modern Doctor Who, think of the Tenth Doctor episode Love and Monsters by Russell T. Davies. I wouldn't be surprised if this book was a bit of an influence on that idea.) If you're already a hard core fan, you'll enjoy this entry; if not, check the show out and then come back to this because it's easy to appreciate one you get all the references.