Tamsyn Muir
Book 1 of the Locked Tomb series
This is really a strange genre bender. In most ways, it is pure, high fantasy. Necromancers doing magic, nine houses under the rule of the emperor, adepts and cavaliers doing battle. But it also hints at a far future, sci-fi. The houses are each from different planets. Life and technology seems to be in a post-apocalyptic phase. Cool.
Gideon Nav is a member of the Ninth house, has a brutal history of abuse at the hand of the house princess Harrow. She is constantly trying to escape, but never successful. When the emperor calls for representatives from each house, Gideon is drafted to be the cavalier (personal bodyguard) for Harrow and they skooch off to the first planet. The goal is to learn how to transcend into a Lyctor, the immortal servant of the emperor. The payoff being new wealth and security for the diminishing Ninth house. Duels, bone constructs, ghosts, murder, and political intrigue. Quite fun. And while the plot pretty much unfolded as you expect while you read, this is OK and largely satisfying. The twists and surprises were surprising to the characters, not to the reader. Looking forward to the next installment.