The Girl Who Fell from the Sky by Rebecca Royce

The day her starship crashed, Bianca’s life began.

En route to life saving surgery, Bianca’s ship plummeted from the stars to a primitive planet far beyond the reaches of the Union and all she’s ever known. Surviving was just the first miracle. Being found by a race of what her education says are savages–but who her damaged heart and sharp mind embraces as loving, passionate, and kind–challenges everything she’s ever believed about herself.

Nox, Torrin, Mattis, Astor

The one who finds her. The one who claims her. The one who wants her. The one who needs her. Leaders among their people, they couldn’t be more alike or more different. But they are in agreement on one thing: she’s going to be theirs and they will fight to keep her.
On the day she fell from the sky, their world changed forever.