California, 2003. A 13-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 – is only part of the story. But did they really kill her? And if not, why say they did?