"The Second Kind" is a science fiction novel by the American writer Philip Dick, which describes a post-apocalyptic world destroyed by a war with machines. The plot revolves around a group of soldiers who discover a dangerous reactive instinct in robots designed to wage war. Through an inventive plot and unexpected turns of events, the author provokes the reader to serious thoughts about the nature of war, technology and the future of humanity. "The Second Kind" is a tense and impressive book that leaves behind many questions and images for discussion.