Following her college graduation, Siddons worked in advertising, but her desire to write led her to journalism,[1] and in 1963 she became a writer for Atlanta magazine,[4] where she eventually became a senior editor.
In 1989 her book Heartbreak Hotel became a movie titled Heart of Dixie, which starred Ally Sheedy, Virginia Madsen, Phoebe Cates, Treat Williams, Kyle Secor, and Peter Berg.
Siddons's book The House Next Door was adapted for a made-for-television movie that aired in 2006 on Lifetime Television, starring Mark-Paul Gosselaar, Colin Ferguson, and Lara Flynn Boyle.
The film tells the story of a woman who is drawn to a home filled with an evil presence that preys on its inhabitants’ weaknesses.
[5] She signed a three-book contract with Warner Books and her novel titled Off Season was released in 2008.