It is a 1986 horror novel by American author Stephen King. The story follows the exploits of seven children as they are terrorized by the eponymous inter-dimensional predatory life-form that exploits the fears and phobias of its victims in order to disguise itself whilst hunting its prey. "It" primarily appears in the form of "Bob Gray" a.k.a. "Pennywise the Dancing Clown," described by characters who see It as resembling a combination of Bozo, Clarabell and Ronald McDonald, in order to attract its preferred prey of young children, though it occasionally feeds on adults. The novel is told through narratives alternating between two time periods, which is largely told in a third-person omniscient view. It deals with themes which would eventually become King staples: the power of memory, childhood trauma, and the ugliness lurking beneath a façade of traditional small-town values. The novel won the British Fantasy Award in 1987, and received nominations for the Locus and World Fantasy Awards that same year. Publishers Weekly listed It as the best-selling book in America in 1986.

The book is dedicated to King's family: "This book is gratefully dedicated to my children. My mother and my wife taught me how to be a man. My children taught me how to be free."

恐怖大师Stephen King1986年美国畅销小说。故事讲述一英国小镇莫名其妙的出现一位貌似小丑的古怪人士，他的出现不是为人带来欢乐，相反却四处恐吓小朋友，甚至为他们带来可怖的厄运或招致死亡；30年后，此邪恶小丑再度重现小镇为害人间，且看长大后的小朋友如何合理对抗恶魔......