The fourth book in the Acorna series some of the backstory is filled in within the first chapter so you don't really have to have read the rest. Acorna is a very beautiful half-unicorn half-humanoid being who was brought up by some humans and thinks she's the only one until she finds more of her kind. She has to work out a way of fitting into society.
In this one she goes in search of a new home and when they hear a distress call they find a world that's lush, when they're attacked by the insectile Khleevi, when searching for a refuge they make a Khleevi ship crash and when chasing them they accidentally discover a way to fight them. They race against time to produce the solution before the Khleevi decimate as many races as they can reach.
I wasn't incredibly impressed but it is quite readable.