Five Seconds to Doomsday — Simon Cheshire

Saxby's arch-enemy plots his ultimate revenge, a truckload of video games vanish into thin air, and the school office is the target of an apparently pointless robbery...In his sixth book of case files, Saxby Smart, schoolboy detective, solves three more puzzling mysteries: Five Seconds to Doomsday, March of the Zombies, and The Shattered Box. In each story Saxby gives you clues. Are you Â'smart' enough to work out the answers?