The book gives a nice overview of the more famous hacks from North Korea's very own Lazarus Group (APT38) -- from attacks on Sony; the audacious attempt to steal $1 billion from Bangladesh Bank (they managed to get away with $81 million); the WannaCry ransomware; and the sprawling multitude of hacks targeting crypto-exchanges and users.

It also paints a picture of how deeply connected and complex North Korea's connections to the criminal underworld run -- even the idea that the majority of the Japanese Yakuza being originally ethnic Koreans.