Full Disclosure: This book was read as an e-ARC (Advance Reader Copy) obtained via Netgalley from the publisher in advance of the book's release on March 7, 2023 in exchange for a potential review. I give my word that this did not affect my review in any way - if I felt conflicted in any way, I would simply have declined to review the book.
Conquer the Kingdom is the final book in Jennifer Estep's "Gargoyle Queen" trilogy, which is itself the second trilogy in the world that Estep started with her Crown of Stars trilogy (so this is really the sixth book in this universe, and events and characters from the first trilogy are important here, even if readers didn't necessarily need to read those books to enjoy this trilogy). This trilogy has followed princess Gemma - known for being a ditzy princess but really an intelligent adventurous spy who relies upon her mind magier magic (telepathy and telekinesis) to try and protect her country from the forces of the sinister Morta. There's just one problem: while Morta's evil Queen Maeven is a clear threat and her son Milo is a monster whose plans to grab power involve destroying her country, Maeven's son Leonidas is another mind magier with whom Gemma has shared a connection since childhood...and a passionate attraction.
This has resulted in a trilogy that deals with the same type of simple fantasy adventure as the first trilogy - there's nothing particularly complex or deep in themes here and will never be - but that has added just a little (but not much) more depth to the romance, including a few actual decent if unexceptional sex scenes. The trilogy has been enjoyable, if often predictable and never really that super exciting and Conquer the Kingdom is the same: a fan fantasy adventure conclusion to this trilogy as Gemma and her friends try to lay a trap to stop the evil Milo and save her kingdom. At the same time, six books in - and three books into this trilogy - it does kind of feel like this style of book and plot is getting old, and I kind of had trouble maintaining my interest enough to finish it.
Note: I read part of this in audio format, which helped me finish it. The audio reader is very solid, if unexceptional, so this is not a bad choice in that format.