Ten-year-old Cathy Corbett is frightened by a ghostly face peering at her from a vacant house rumored to be haunted. The ghost turns out to be the house's new resident, a girl Cathy's age who calls herself Bluebird. Through fantasy games and magic tricks, Bluebird helps Cathy escape a troubled home life, and they develop a sisterly bond. But Bluebird disappears when Cathy's life takes a tragic turn. Six years later Bluebird is back. She is desperate for Cathy's help in finding a way to end the vendetta of a vicious, vindictive hitman who wants to kill her. The teens set a time and place to execute a dangerous plan, but Bluebird is a no-show. Did the hitman find her? Did she panic and run? Is she dead? Or will Cathy be forced to acknowledge what her father and psychiatrist believe--that Bluebird is merely a damaged girl's hallucination? When the truth about Bluebird finally comes out, Cathy and the person she loves most will be thrown into a fight for their lives with a killer who is very real and very deadly.