I love the Threadbare series and will definitely have to check out the other books in the shared universe. This book is a culmination of them all and is meant to wrap up multiple story lines and close out the world of powerful, but friendly, living teddy bears who just want to help. Sadly I felt that it didn't stick the landing.
The second trilogy of Threadbare books already seemed a bit less...cohesive than the first three, with characters from another trilogy, subplots built on subplots, and characters that seemed like they would be important, but were left behind. Still, the maintained the essence that forced me to consume each book in roughly three days each while ignoring other (probably more important) tasks. The ending however just fell flat. Random situations appeared without warning and so felt like they had no real stakes, two "villains" peaked and were defeated in such a short amount of time that it felt like whole chapters were missing, and story lines were left unresolved.

Spoiler

Importantly the story was always about a teddy bear and his girl, but the story ends with an afterward saying that he returned to her, the end. No resolution on how they handled the war, how Cilia dealt with her PTSD afterward, nothing. Cilia was barely a factor in this last book at all.

Overall I highly recommend the series, but I wish this last book could have either been a little longer to give a proper ending, or had dropped a few plot lines to give better care to others.