There are some books I'm probably too close to to review objectively, and this is one of them- I am terribly fond of it, including the imperfections.
Serious trigger warning for physical and verbal abuse of the heroine by her brother, depicted multiple times on screen, negligence by other family members who let it go on including their mother, and references to a past abusive husband in a short-term contract romance.
Aelliana Caylon is a mathematician renowned for her revision of the critical tables of calculations used by pilots to navigate space and for the survival mathematics class she teaches at a technical college, but her life is tightly circumscribed by her abusive brother Ran Eld, their mother's chosen heir, who hates her and views her as a threat to his position in the succession after overhearing his aunt claim that Aelliana is the better choice for delm of the family, despite their mother's favoritism.
Aelliana keeps her head down and endures, going between her teaching job and home and forming close ties to no one until, wandering after an incident with her brother, a few of her students come upon her, invite her to join them at a new casino in town, and subsequently deploy her in service of a vendetta against a feckless aristocrat who takes pleasure in ruining the young and innocent at cards. Aelliana, whose thesis concerned the relevant game of chance, demolishes the man at his own game and wins a spaceship in the bargain and hope for escape from her brother, if she can only learn to properly fly it.
Daav yos'Phelium is the delm of Clan Korval, the Highest of High Houses and also, incidentally, the most eccentric of High Houses. His mother and elder cousin perished in an attack on the House years before that his aunt and foster mother barely survived, and since Local Custom she too has passed away, leaving the House woefully small and Daav in need of an heir to increase the numbers of the House as soon as possible. He finds himself in need of an escape from the pressures of his duties as Korval Himself, his impending contract marriage, and the defense of his beloved foster brother's new Terran lifemate, and so he retreats to the company of the Scouts that duty forced him to leave behind, working semi-anonymously as a mechanic in an old friend and teacher's repair shop to blow off steam.
Naturally, this is the warehouse where Aelliana's brand new ship is docked, and they grow closer as Aelliana befriends the crew at the repair shop who become as a found family to her and takes, very quickly, to piloting. But it's unlikely she can hide a whole ship from her brother forever...
This is a story about enduring abuse, about trying to rebuild oneself in stolen moments, about slowly reaching out to other people and building relationships, and confidence, and maybe even pride. Aelliana's development is wonderful to watch, as is her growing closeness with Daav, and there are a couple of well-handled subplots as well. It also hits a particular sweet spot for me as a people learning to do things/people working story with Aelliana's piloting endeavors and it's a nice continuation of certain elements from Daav's brother's story Local Custom, with which it was originally released together in the omnibus Pilots Choice.
This is a romance in that it has a happy ending where the couple ends up together, but it may frustrate romance readers because the book ends... in media res in a lot of ways with regards to the romance, though their commitment to each other is decisive. There is a much later written sequel, Mouse and Dragon, that I cannot recommend- I felt it handled the matter of Aelliana's abuse as poorly as Scout's Progress handled it sensitively, there were several smaller things that made Scout's Progress a retroactively weaker book knowing them, and, most grievous of all, a _key_ scene is completely omitted from the book and happens off-page because the events were chronicled in a previously published novelette, "Guaranteed Delivery". My recommendation is to avoid Mouse and Dragon and seek out the short story instead.