During the summer before ninth grade, intrepid Gilda Joyce invites herself to the San Francisco mansion of distant cousin Lester Splinter and his thirteen-year-old daughter, where she uses her purported psychic abilities and detective skills to solve the mystery of the mansion's boarded-up tower.
After her mother's suicide when she is twelve years old, Yuki spends years living with her distant father and his resentful new wife, cut off from her mother's family, and relying on her own inner strength to cope with the tragedy.
While Stolly struggles to regain consciousness in a hospital bed, Ian recalls some of their best and worst times together as he writes a biography of his eccentric best friend.
