I've spent a lot of time exploring the 'Perfect Dark' universe beyond just the games. The franchise has a rich expanded universe with novels that dive into Joanna Dark's adventures. There are three officially released novels: 'Perfect Dark: Initial Vector' and 'Perfect Dark: Second Front' by Greg Rucka, which are direct prequels to the game 'Perfect Dark Zero', and 'Perfect Dark: Janus's Tears' by Eric Nylund, which ties into the original N64 game. These books are packed with espionage, futuristic tech, and the gritty atmosphere that fans love.
If you're into the lore, these novels are essential reads. They flesh out the world-building and give depth to characters like Joanna and her father, Jack. The writing style is fast-paced, mirroring the action-packed nature of the games, and they’re great for fans who want more from the 'Perfect Dark' universe. There were plans for more books, but as of now, these three are the only ones available.