20,000 nerds under the sea

"Neil and his crew have reunited at Reboot Robiski's video-game convention in order to try the brand-new underwater game Captain Jolly's Shark Hunt. Except that their win only leads to trouble. Neil, Sam, and Biggs are captured by the real Captain Jolly, who needs their video-game skills so she can destroy the world. As they embark on an underwater adventure, can the Nerdy Dozen save the day before everything is KO'd? "--Dust jacket flap.