His book 'Cell' is a science - fiction horror. In this book, a mysterious signal transmitted through cell phones turns people into mindless killers. It explores the idea of how technology can go wrong and the chaos that can ensue, which is a common theme in many of King's works.
Stephen King has written some great science - fiction works. '11/22/63' is also a great one. It involves time travel as the main theme. The protagonist travels back in time to try and prevent the assassination of President Kennedy. It's a thrilling read with elements of science fiction intertwined with historical events.