In The Proof that Ghosts Exist , Molly and Adam managed to save their father from a family curse and near-certain death on the day before his thirty-fifth birthday. Or did they? An unfortunate "error" on their dad''s birth certificate means that he''s still at risk, and it''s up to Molly and Adam-and their ghostly grandfather-to keep him safe. But how are they going to manage that when he''s off to Palm Springs, California, for a film festival?