Started The Exodus Gambit (House Adamant 1) by G Stewart and I quite like it so far - the usual ruling family of a planet is decapitated in a sneak attack by a member desiring the crown but lower on the succession pole but one junior member of the ruling house (a daughter who is an officer in the Planetary Navy here) survives by luck and wants to get back her rights and the throne, but well done and with interesting characters and setup.
Blurb:
In a single ruthless blow, Commander Lorraine Adamant’s favorite uncle murders everyone ahead of him in the succession for the Star Kingdom of Adamant. Only luck and the paranoia of her bodyguard, Vigo Jarret, saves Lorraine’s life. On the run in a single starship Lorraine should never have commanded, with a crew she can not trust, she swiftly learns her uncle’s hounds are hot on her heels. She must gather every skill, every trick, she has ever learned if she is to survive—and pray the uncle who taught her those tricks is a step behind. Because one thing is certain: Lorraine Adamant will save her Kingdom—or die.