The Massively Multiplayer Mystery

"All fun and games?
Not!
There's a hot new online gaming phenomenon that's got Team Spy Gear's classmates enthralled. But when the mass enthusiasm for the game gets kind of, well, intense, our spies decide they've got to figure out who's behind the game. Fast. Oh, and also how it all relates to the oldest surviving epic in British literature.
You know, just a typical day's work for our under-the-radar tween spies living in suburbia..."