Only you can save mankind : Johnny Maxwell Series, Book 1

Af Terry Pratchett (2009)
Summary: IF NOT YOU, WHO ELSE? As the mighty alien fleet from the latest computer game thunders across the screen, Johnny prepares to blow them into the usual million pieces. And they send him a message: We surrender. They're not supposed to do that! They're supposed to die. And computer joysticks don't have 'Don't Fire' buttons . . . But it's only a game, isn't it. Isn't it?
Serie: 
Serie: 
Summary: IF NOT YOU, WHO ELSE? As the mighty alien fleet from the latest computer game thunders across the screen, Johnny prepares to blow them into the usual million pieces. And they send him a message: We surrender. They're not supposed to do that! They're supposed to die. And computer joysticks don't have 'Don't Fire' buttons . . . But it's only a game, isn't it. Isn't it?