The Dark Triangle is a juvenile science fiction novel, the twentieth and last published in Hugh Walters' Chris Godfrey of U.N.E.X.A.

One final book - The Glass Men - was written, but was never published.

A copy of the completed novel was sent to then serving prime minister Margaret Thatcher and president Ronald Reagan in 1982.

Chris Godfrey and company investigate and are captured by strange creatures.

This article about a children's science fiction novel of the 1970s is a stub.