It's taken me way too long to write about these, mostly because I've had a hard time coming up with anything to say. The plots are all complex and since it's a whole series, I can't go into too much detail, especially beyond the first one, without giving things away. Basically, though, the entire series revolves around Euginides, an expert thief, who has been captured and can only earn his release by stealing a valuable treasure that could change the course of three nations. Each of the books continues the Euginides' story and has an overarching storyline, but each book is also its own story. No cliffhangers here - you can read the stories book by book without missing anything, but if you're like me you won't be able to stop after the first one.
Not a single complaint. One hugely successful aspect of the writing is the age range that these books can appeal to. They're intended for an older middle grade/younger YA audience and written for that audience's reading level, but they are still so smart and relatable. I think they'll appeal to all lovers of YA and to adults as well. I would recommend these to younger readers (or even as read-alouds), but I've also recommended them to my husband. I rarely read MG, but I'm so glad I made an exception for these. They're really ageless - like the Narnia books or Harry Potter.
Like I mentioned above, I couldn't read them fast enough. I fell completely in love with the characters, the setting, the relationships, all of it. It was this summer's Song of Ice and Fire (but shorter and clean) for me - I just became completely immersed in the world to the point that I couldn't think about anything else.
I can't say enough good things about this entire series. Each book was better than the last. The author has a fifth book coming out at some point in the future, although no date is announced yet. However, because each story has its own arc, don't feel like you need to wait for the series to be complete. It's just beautiful and I recommend it to everyone, especially those who are into fantasy worlds like Westeros, Narnia, and Middle Earth.