The rumor mill at Sector General is usually fast but not necessarily very accurate. As this story begins, it's generating rumors very disquieting to Conway, who can't understand why he's being given minor short-term chores, rather than his usual work on Rhabwar.
In the course of one such chore, he encounters the shape-changer Danalta, which insists that it is not a 'doctor', though, as Conway points out, its proposed behavior fits the job title.
Conway can't even get useful information out of Prilicla, which worries him even more, since Prilicla gets evasive (and sometimes lies outright) only when it thinks telling the truth will cause someone emotional pain.
The truth, when it comes out, is not so much painful as disturbing. Although Conway has done Diagnostician work before (in Star Surgeon, where it almost cost him his sanity), he hasn't really been keeping track of time (it's been about 12 years since he first came to Sector General), and he hasn't realized that it's about time he was given a probationary appointment to Diagnostician.
O'Mara, recognizing that Conway will need time to think things over, sends him to Goglesk--hardly the place for a restful holiday.
The Gogleskans, it turns out, have a terrible problem: whenever one of them is startled or fearful, the affrighted individual utters a 'call for joining'. Everybody within earshot joins tentacles, and through contact telepathy, forms a gestalt entity that mindlessly smashes (and/or poisons) anything that's not part of the gestalt. Ships, libraries, factories, domestic animals...just anything in sight.
The Gogleskans don't know why this is so, and neither do the Federation observers--until Conway figures it out, in circumstances that nearly cost him his life. If the Gogleskan Healer Khone hadn't already been working on the problem itself, the odds are Conway wouldn't have survived to pass on his insights. Reckless? Well, yes, but that's Conway's style, after all. The fact that he's made it this far is only partly survival of the luckiest--he also has a very good bedside manner, and a good ability to put himself in sync with some pretty alien mindsets. So he not only gets lucky--he gets help.
But the help often has some very strange aftereffects. In this case, Conway finds himself with an unerasable memory recording, similar to the Educator Tapes, but different enough to cause confusion and other mental problems (all Gogleskans are necessarily solitary, and Khone is both unusually fearful and unusually brave--and, at Sector General, is exposed to situations it finds terrifying).
I should point out that the argument that females can't use Educator Tapes has been belied from the beginning, since several of the prominent doctors who recorded the tapes have BEEN female (The Hudlar tape Conway gets is a prime example. ALL Hudlars are both female and male (the hormonal changes after gestation change the females to male form: and their lifemates are concurrently rendered female. Wonder how that's triggered?). In this case, it's evident that the rapport is mutual, and that Khone (who is either female or bisexual, given that it later gives birth) received Conway's memories, as well. This story is followed up both in Code Blue: Emergency and in The Genocidal Healer.
After his return to Sector General (and his recuperation, which involves what must be some fairly odd sex with Murchison), Conway is thrown almost at once into the complex problems of Diagnosticians. Rhabwar (now under the medical command of Prilicla, who convinces people to do as they're told for fear of hurting its feelings) is sent to a large scale disaster in a previously unoccupied star system now heavily used for metal extraction (and in desperate need of a better traffic control system). Prilicla, on triage, is reluctant to declare any casualty with any life remaining as hopeless.
Conway has been working on the separate case of Hudlar geriatrics, so it's not surprising that his portion is four nearly hopeless Hudlar cases. He's not expected to do much of the hands-on work, luckily, because o'Mara and Conway's fellow Diagnosticians understand that he won't be able to do anything that requires physical dexterity until he gets a better handle on the Educator Tapes he's carrying. His main job is to come up with surgical strategies which others will put in practice.
This book contains quite a bit more background information on Conway than any of the previous ones. This is done largely to explain how Conway's personal history affects his empathy for others. Thus, for example, the fact that, after being orphaned at a very early age, he was largely raised by his great-grandmother, who died when he was about eight, and that he became a doctor in large part so that he would never again have to stand helpless before death, becomes an important part of the reason he's so well able to empathize with the problems of aged Hudlars.
Which raises an interesting question. The argument is made that, since the Educator Tape impressions are only memories, the entities involved can't learn. But the host learns, and surely the memories are modified thereby? One wonders if a recording taken from a Diagnostician would be the same as the original tape, or if the amalgamation in the host's mind would change the recordings, perhaps in creative ways. The assumption is that it's only the host that's changing...but might it not be synchronous?
Conway keeps coming up with new resolutions to problems faced by Diagnosticians--including some he has almost certainly not have come up against before. Interviews with amputees and transplant patients, for example. I note that there doesn't seem to be any mention of growing new organs from the patient's own DNA here. I understand that in emergencies, this isn't an option--but once the patients have been stabilized, is this not a possibility? As for appealing to patients on a hormonal basis, I'm dubious about this. A Hudlar in female mode is still a Hudlar. And in the case of Hudlars, it seems likely that it'd be the males who would be most concerned with childcare after the female gives birth, since the female is becoming male, and the male becoming female. Of course, in Earth humans, nurturing behavior is the province of both males AND females...and one would think this would be true of Hudlars, as well.
The problem of the relations between Diagnosticians and their lifemates is one that would, of necessity, be idiosyncratic. It's not just that, for example, Tralthans seem to have an oestrus/musth mating season, and otherwise to be only academically interested in sex (though sometimes, as with Thornnastor, the academic interest is intense...). It's also that INDIVIDUALS have their own (often variable) levels of sexual interest, and so, often, do the taped entities. Conway's solution is a bit unusual even in such a complex situation, but not THAT far out.
The problem with the geriatric Hudlars is subject to solution that, it turns out, is tied to Conway's personal history. But it's likely that this is why he was assigned so many Hudlar cases in the first place.
The other main problem in this case is the problem of birthing an intelligent Protector of The Unborn. In this case, part of the problem is that a new sort of C-Section needs to be invented... Then there's the question of which of two nearly identical sacs produces the chemical that frees the newborn from paralysis, and which destroys its mind. And time is limited, because the maternal Protector can't be restrained for long without losing consciousness and dying.
One thing I found sardonically amusing is that the kindhearted Hudlars are emotionally traumatized by having to beat the adult Protector to keep it alive--so they try to soothe themselves by playing Hudlar music--which drives members of other species up the wall.
Another question I've just begun to wonder about is why there don't seem to be many allergies among species in the Federation. Autoimmune disorders seem oddly missing. I started wondering about this when it was stated that species other than Hudlars can receive transplants and, after a period on immunosuppressants, can return to their normal lives. I'm not sure whether this is always true wit present-day humans. But if they could receive new organs grown from their own genotype, it might be possible for even Hudlars to return to normal life. It might be worth investigating.