Private eye Sharon McCone receives an email asking for help from her emotionally disturbed half-brother, Darcy Blackhawk, but he fails to reply to her response. As Sharon digs deeper, she discovers that Darcy sent his message from an Internet cafe in San Francisco, a city he's never been to before. Sensing that Darcy is in terrible danger, McCone begins a search for him throughout the city. The investigation leads her to the body of a woman at the Palace of Fine Arts, where a witness told her Darcy was headed. As her search widens, Sharon uncovers a connection to an unsolved murder of a young woman who was heiress to a multimillion dollar banking fortune. Sharon must race to solve both murders and ensure her brother's safety, despite the imminent danger that lurks within her own family.