“Happy Face,” which begins airing Thursday, is inspired by the true story of Melissa Moore, whose father was a prolific serial killer infamous for drawing smiley faces on letters to the media and prosecutors. She was just 15 when he was captured.

In December 2024, the convicted killer called in to “The Lighter Side of True Crime With Keith Rovere” podcast to promote his book, “Happy Face: A Family of Monsters (Straight from a Serial Killer),” which hit shelves in January. A description for the book describes it as giving “unparalleled access to a serial killer’s mind.”

She says the “ping pong”-like, back-and-forth style of their confrontations, during which Jesperson emotionally exploited his daughter to boost his ego, is authentically depicted onscreen. “There was always a reason why my dad would say something to me,