Private eye Sharon McCone receives an email asking for help from her emotionally disturbed half-brother, Darcy Blackhawk. As Sharon digs deeper, she discovers that Darcy sent his message from an Internet café 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 had told her that Darcy was headed. Then, as she digs deeper, Sharon uncovers a connection to an unsolved murder of a young heiress to a multi-million dollar banking fortune. Now Sharon must race to solve both murders and ensure her brother's safety, despite the imminent danger that lurks within her own family.