Bat Boy's got nothing on Joyce McKinney, the subject of Errol Morris' latest documentary, which tests the old adage about truth being stranger than fiction. Tabloid tells the story of the 1970s southern pageant girl, who met a young Mormon named Kirk Anderson. That's about the only detail we know for sure. McKinney claims that she and Kirk fell in love but that he disappeared one day. After hiring a private investigator, she learned he was in England and flew to rescue him from the "cult" that had abducted him. Ask almost anyone else, and they'll say McKinney abducted Anderson and made him her sex slave. Morris tells McKinney's story with humor and heart, but the director's real gift lies in the serious questions he asks about truth and justice and desire.