Ray Bradbury 
Zero Hour [EPUB ebook] 

Mink and the neighborhood kids are hard at work outside all day, playing a game called Invasion. Or at least that’s what her mom thinks. Throughout the day, the mother continues to have strange encounters with Mink as she talks about her friend, Drill.

Classic Short Story by Ray Bradbury, the master of science fiction whose imaginative and lyrical evocations of the future reflected both the optimism and the anxieties of his own postwar America.