It's okay... The stockholm syndrome was interesting at the beginning, but it didn't build on it. With every criminal/arc, there wasn't any character development for the protagonists, so that was a little bit disappointing. The rest is average. I'd say read this to understand how to not do a story. It's a quick read, so you'll probably won't waste your time. What was good is the puzzle at the end of the story with the japanese alphabet as the answer, that was pretty clever from the author and props to the translators for translating all that. Hopefully, the author rebounds with something better.