Here's why:
* Spy Thriller: The core plot revolves around a married couple who discover each other's secret lives as highly trained assassins working for rival organizations. It's full of espionage, action, and suspense.
* Action: The book features intense fight scenes, chases, explosions, and other action sequences typical of the genre.
* Comedy: The book is also light-hearted and humorous, playing with the absurdity of the situation and the contrasting personalities of the main characters.
* Romance: While the focus is on action and espionage, there's a romantic subplot involving the couple rediscovering their love and dealing with their conflicting feelings for each other.
The combination of these genres creates a unique and entertaining reading experience.