Based on the novel by English author Neil Gaiman, a blend of Americana, fantasy, and various strands of mythology, all centering on the mysterious and taciturn Shadow. Several of the themes touched upon in the book were previously glimpsed in The Sandman comic book series.
The central premise of the novel is that gods and mythological creatures exist because people believe in them (a type of thoughtform). Immigrants to the United States brought with them spirits and gods. The power of these mythological beings has diminished as people's beliefs waned. New gods have arisen, reflecting America's obsessions with media, celebrity, technology, and drugs, among other things.