Invisible is a 2005 young adult novel by American author Pete Hautman, detailing a 17-year-old boy's battle with his inner demons/mental illness and his descent into insanity.

He creates, a town involving the trains, called Madham and obsessively builds a replica of the Golden Gate Bridge using match sticks in the basement of his parents' home.

As the book progresses, Dougie mentions attending (and skipping) therapy sessions and not taking the medications he had been prescribed for anxiety.

After an incident at school, Dougie eventually admits to his psychologist that he hasn't been taking his medications and is also forced to remember a fateful night at the Tuttle Place.

"[2] Cooper agreed, writing, "The truth about Andy won’t come as a surprise, but there are some unexpected plot turns here, and the chilling but ambiguous denouement is definitely unsettling.