Once upon a time in a place far away, lived a man named Gary Larson who used to draw cartoons. It was a cartoon that appeared for many years in daily newspapers and was loved by millions. (And was confusing to millions more.) But one day he stopped.

Gary went into hiding. He made a couple short films. He played his guitar. He threw sticks for his dogs. They threw some back.

Yet Gary was restless. He couldn't sleep nights. Something haunted him. (Besides Gramps.) Something that would return him to his roots in biology, drawing and dementia--a tale called There's a Hair in My...