"I'm working on the greatest mystery ever!" was the last thing noted mystery novelist Mercedes Livingston said to seven-year-old Chris Matheson before walking out of Hill House Hotel never to be seen again.

For decades, the writer's fate remained a puzzling mystery until an autographed novel and a letter put a grown-up Chris Matheson on the trail of a cunning killer. With the help of a team of fellow retired law enforcement officers, each a specialist in their own field of investigation, Chris puts a flame to this cold case to uncover what had really happened that night Mercedes Livingston walked out of Hill House Hotel.

Watch out! The clues are getting hot....