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Fleet Captain
I read the description for 'Paths of disharmony'.
I think it describes half the book (which most likely is as follows):
After the borg genocide, with the andorian population at an all times low, a solution to their reproductive problem is reconsidered - the reduction from 4 genders to 2. Of course, this causes social strife in andorian society.
Furthermore, the andorian-rest of the federation relations are worsening, what with a third of Andor being vaporised on Starfleet's watch.
In these conditions, a summit on Andor is convened, the Enterprise attending.
But a surprise guest appears as well - the tholians, who offer the andorians a cure to their reproductive crisis (while keeping their traditional 4 genders). In exchange, the tholians ask the andorians to leave the hippy federation and join the typhon pact, an alliance kindred with the warrior nature of the andorians.
The more I think about the more the more I realize that it could be the two sexes thing, it definitely would upset alot of the Andorians, and would solve the problem.
The ending of 'Paths of disharmony' could go either way:
Making the andorians leave the federation could actually be beneficial for the andorians (as a species in the trek franchise), in the sense that it would bring them to the forefront, provide future books with something of substance to develop and, thus, assure future in-depth development for them - as opposed to the relative neglect the species suffered until now. This would be a 'gutsy' choice.
Of course, at the end of the book, the andorians could remain in the federation, in tune with the 'rebuild' optimistic theme authors claim, on this site, will characterise future trek lit books.
Will they still be dying in this case? Most likely yes; this is one of the few particularities of the species that can be interestingly used in the future.