When Luke and Clyde go missing after a trip to a laser-tag arena, Sarah Jane and Maria go to talk to Mark Grantham, the shifty owner. After some investigation, they realise he is working with Kudlak, an alien warrior, to recruit soldiers to fight a war on the planet Udvoni! Will Sarah Jane and Maria be able to stop him? Based on an episode of "Sarah Jane Adventures", this fantastic novel has colour inserts showing scenes from the BBC series.