This is book two of Gav's Path of the Eldar series. Written a few years ago, it takes place before the events of the birth of the Ynnarri and the Dark Imperium, so the Eldar lore may have evolved a touch since these novels were written.
Regardless, this was a splendid read, as was the first book, though this books main character, Thiriana, was far more interesting and likeable than the self absorbed, whiney Korlandril.
Eldar society (Elves in space) revolves around the notion of Paths: these are choices made by individual Eldar to follow a path that demonstrates the perfection of a facet of their personality, be it artistry, service, industry, even warfare. Thiriana, formerly a poet and a warrior on paths past, determines to follow the Path of the Seer.
Farseers are essentially psychics, powerful ones too, with a bit of high wizardry thrown in as well. They can travel the skein of fate, and discern the multiplicity of outcomes of a single action.
In this, the idea of Eldar Farseers borrows heavily from Masonic, Kabbalistic, Gnostic, and Buddhist theologies and ideologies, something most fans won't pick up on but which I couldn't help but notice.
Thiriana, an extremely gifted girl who progresses farther in her training than most newer Seers, scries a haunting possible future of a massive human invasion of Craftworld Alaitoc.
In Warhammer 40K, which is basically Fantasy in Space!!! (Exclamation points mandatory), Elves/Eldar and Humans/Imperium of Man, aren't allies by dint of a possible shared heritage, looking similar, and both standing against the forces of Darkness/Chaos. Rather, the 40K meta narrative sees humans and Eldar somewhat often beating the hell out of each other, with alliances being rare and strained.
Thiriana brings this possibility to the Seer Council, where she is basically laughed at for being overly paranoid. Yet she doesn't give up and eventually more information comes to light that shows that she is, indeed, correct: the humans are a tad pissed and determined to put a hurting on the Space Elves.
The ensuing battle, seen from Thiriana's perspective, is not quite as epic in scope as that of the first book, though the naval battle which proceeds the invasion is giving far more detail. (Side note, Gav Thorpe is a naval history buff, something I find cool as can be as I myself am a military historian). Although the scope of the fighting is telescoped due to Thiriana's perspective, it is no less visceral and dramatic. Gav does a very good job with the action, though the reasonings for the human invasion are only partially explained, which is an improvement over book 1 where it was a mystery as to why the humans were suddenly intent on kicking Eldar teeth down throats. It is assumed all will be explained in book 3.
Overall this was a very fun book to read. It delves deeper into Eldar societal structure and mores, follows a significantly more interesting and relatable character than book 1, and takes a fascinating, esoteric journey into the world of the Seers.