Nightmares & Dreamscapes: From the Stories of Stephen King: Umney's Last Case

After the death of his son, writer Sam Landry is so desperate to lead another life, he writes himself into his own book, forcing his long-time character, Umney, to change places with him and live in the modern day. But things get deadly when Landry realizes Umney is trapped and cannot write himself out of his new reality.