Finished Exodus: The Archimedes Engine by P Hamilton and it quite surpassed my high expectations as it brought back the inventiveness, sense of wonder, and great characters that the author first displayed in his Night's Dawn trilogy and which was only partially seen in the rest of his work since.
And this with no ftl, aliens or inteligent ai's but with various kinds of humanity-descended advanced species, the Celestials, regular humans, and uranic humans (the ones that interface between the Celestials and the humans under their dominion) is that a good though the Celestials hand while firm and all-seeing is also quite benevolent in the worlds the action takes place as of now - though of course hints of malevolent Celestials and oppressed humans appear here and there - as the regular humans have high tech civilized societies, though with the usual blemishes, like gangs and drugs, fierce competition that can descend in all-out fights between factions etc).
The Celestials of our story - the Crown Dominion - while seemingly above this, have their forms of intrigue and competition, including powerful fleets that guard their borders against other potential malevolent Celestial races. And of course, the supreme Celestials of all, the mythical Elohim who long ago terraformed the numerous systems of today, are missing in action though their handiwork is still there (they are the only possessors of the Archimedes Engines who can move planets and stars and of the ability to create the interstellar gates through which spaceships move at 99.999 speed of light making the interaction between the numerous worlds of the Centauri cluster possible if still time-consuming for the ones not traveling relativistically).
At the high level, we have Helene-Chione, one of 5 (immortal mindline Helene, Chione being the current body name) Queens of the Crown Dominion Celestials which has seemingly been quite stable and prosperous for millennia, since the 5 Queens and their solar systems ganged up on the 6th which supposedly wanted dominion over all through dark genetic manipulations; but there are rumors of an Archimedes Engine planet hurtling towards them which can destabilize the current arrangement and after all, when 5 ganged on the 6th, 4 can gang up on the 5th on some pretext or another...
While of fairly young body, Helene has numerous consorts and gives birth (well, produces eggs that her consorts carry out to term...) to various children, of which the most promising daughters are groomed as princesses in waiting if something happens to the Chione body or when it ages out after 7-8 decades; but since the mindline can be transferred only at fairly young ages before personality sets in, the process continues as the aged-out princesses become valued members of the court and new such are instated; one is Thyra, single daughter of minor noble Bekket (known derisively as oneshot as usually more eggs are produced by the Queen) but with mysterious abilities of his own; and of course the other 4 of the current in-waiting brood, some true sisters and all from high born fathers, gang up on Thyra at any occasion, but Thyra seems to be a match for any and all of her rivals as she conclusively proves at the First Trial riding a unicorn against powerful modified beasts...
At the (to start) low level we have Finn, uranic son of one of the noble families that rule Gondiar, the human agricultural planet in Queen Helene's system, who is super-bored with his role, associates himself with discontented humans and dreams of flying to the stars with the Traveller families who own spaceships and go exploring and bringing old Remnant tech to the Celestials from dangerous places; to establish enough creed, he flies to the Anoosha the other human planet in the Dominion, an industrial one under a fellow/rival Celestial Queen, gets in over his head in the process and opens the book by being thrown outbound and naked from a high altitude plane... While a drone breaks his fatal fall, he still needs rescuing (as he is thrown naked into a snow-covered area) and we meet human newcomers Ellie of arkship Diligent and Josiah (her many generations ancestors, originally born of Earth 40000 years or so before and recently thawed), now marooned on Anoosha and strangers in a strange land. Finn wants to fly to the stars and would do anything it takes for that...
Also, we have Terence a young and upcoming detective in Santa Rosa, the capital of Gondiar, who accepts an interesting assignment and becomes involved with Celestial and Traveller intrigue which of course can get quite dangerous in itself.
With a layered and complex storyline of which we get successive glimpses only until the powerful finale which leaves the story at a good stopping point (thankfully no planet hopping waterfall ride this time as its sort of analog here is done earlier) the book is an extraordinary achievement in which the author really let fly his imagination.
Best of the year by far and will be hard to top in the promise sequel and duology ending The Helium Sea.