California, 2003: A thirteen-year-old girl disappears from a party at Carlsbad's Turtle Lake. Discovered on the trunk of a nearby cottonwood tree is the word 'LIAR' graffitied in blood. Three teenagers went to the lake that night but only two came back. Later, they confess to murdering their friend. But this is only part of the story. Did they really kill her? And if not, why say they did?