As of November 1st, the newest installment in the G.M. Berrow books is officially available over on Amazon. You can pick it up for Kindle, physical hardcover, or an Audible audio book. The description is pretty vague, but if you liked the other ones from the Princess Collection, you will probably like this one too.
Go get it over here.
And get the other Princess books if you need MORE pony over at these links: