Do you like McCoy? Don't you like that alcoholic, racist, Southern bumpkin who seems to be a transplant straight out of the 1930s? Well, even if you do, too freaking bad, because this book is all about getting to know McCoy is his 20's, when he's rather objectively worse.
I don't know, there seem to be quite a few fans of McCoy out there, and I'll never understand why. The man is an asshole, who constantly spouts angry rants and shoots down everyone else's ideas as if they were proposed by crazy madmen trying to get everyone else killed. I mean, I guess you can kind of interpret it as a "straight man" for the more outlandish members of the crew, but to me, he just comes across as hopelessly irascible, acerbic, and otherwise just generally asshole-ish, who's greatest career ambition is to be an "old, country doctor in the rural South" where he would presumably cure patients with bleedings and leeches whilst talking about their humors with how anti-technology he proclaims to be. And I will never understand why the writers back then made the characters the way they did. Whenever they reminisce about their childhoods, they always sound like they grew up in turn-of-the-century-Americana-land, putting little girls pigtails in inkwells and jumping naked into fishin' holes alongside Tom Sawyer and Huck Finn. I get that the writers themselves grew up in the 1930s and 1940s, but the characters live 200 years later and they either lacked the imagination to breathe life into the 22nd century, or they were too worried that the audience would be unable to imagine a future world.
Anyway, even if that's the McCoy you like, here you're going to get a big strong dose of a McCoy who is even worse. Due to an accident involving some brain-eating aliens, McCoy hits his head and gets amnesia, only it turns out to be because of pure hysteria and not injury, and he suddenly doesn't remember the last 25 years. So, we have a young McCoy who has all those traits in spades. He hates space, he hates Starfleet, he doesn't know who anyone is, and as he learns about his future self, he hates who he has become, since even as a young 20-something, he just wanted to retire onto an old Southern plantation and lazily sip mint juleps whilst he made the occasional house call for consumption or falling sickness or the vapors or whatever other 19th century ailment you can think of. Am I letting my dislike for McCoy color this review? You bet I am. I just don't like him and I don't want to read hundreds of pages about an even worse version of him. I had hoped that sort of parochial provincialism would be something that died out by the 22nd century.
Now, don't get me wrong, this kind of story can and has been told well and enjoyably, "Tapestry" from TNG comes immediately to mind. But, that's because Picard was a likeable character by then, and it was fun to see the young, less-seasoned Picard...whereas McCoy is just a stick-in-the-mud. He also bones (pun intended) another doctor whilst he has this hysterical amnesia, who is 20-years younger than him and apparently always wanted to bone him...which leads to a sort of moral question about consent. For McCoy isn't really himself, and not because of injury, but because of psychological trauma, so, can he really consent at this point? Of course, it's a moot point anyway, because once he regains his memory - which seems to spontaneously occur off camera - as we cut to commercial after another doctor almost kills Spock on the operating table, but after the break, good ol' Bones McCoy is back, having saved Spock, since apparently all his memories came flooding back in an instant. Only, he has completely forgotten the last two weeks.
So, he's learned nothing. That entire adventure of potential self-discovery or learning to not take what you have for granted or any sort of growth which could have occurred from getting a fresh perspective on youth or seeing what your staff thought about you now that you aren't lording over them or even the potential thread of love that occurred from a tender moment with another person, as problematic as they may have been - nah, fuck that. It's all been erased as if it never happened...except to everyone else...who, I guess are supposed to have a fresh perspective on McCoy and like him more now, even though he has not and will not change.
Oh yah, and then the plot. So, the brain-eating bird people apparently kind of become whoever they eat (I guess they can only eat one brain) and one of them has eaten a Klingon commander who, during the climactic battle, becomes himself fully and tells Spock that he's going to go face-to-face with the bird-queen (who's a giant slug monster) and that when he gets there, Spock should transport a bomb to his coordinates and problem solved...so, hooray for someone else being a hero and risking their own life so that we don't have to potentially endanger the main cast.
As to what's going on on the cover, you got me? It's the movie Enterprise and a movie Bird-of-Prey during what is clearly a TOS-era story, based on the uniforms (and the fact that this takes place shortly after the Organian Treaty), with Kirk doing some kind of zombie pose?
So, um...yah, skip this one...skip it hard!