Demons is a Star Trek: The Original Series novel written by J.M.

This story is continued in the Star Trek: The Next Generation novel Possession, also by J.M.

The book made the New York Times bestseller list in July 1986.

[1] Robert Greenberger praised the novel for "some nice bits about Vulcan ritual and mind-control".

This article about 1980s novels and other printed work relating to Star Trek is a stub.