Annaleigh Ashford and Dennis Quaid star in the inspired-by-a-true-story series about a serial killer's daughter ...

Let this be your go-to resource. At 15, Melissa discovered her father, Keith, was the Happy Face serial killer, defined by the smiley faces he drew on letters he sent to media outlets and the police.

He became known as the Happy Face Killer because he drew smiley faces in his letters to the media and authorities. He taunted them just like another infamous murderer known as The Zodiac Killer.