Out of nowhere

the long version

"Zen student and stunt double Darcy Lott is thrilled to be reunited with her brother Mike, who disappeared twenty years earlier. But her joy at bringing him home to San Francisco turns to fear when she learns that he has become the victim of escalating attacks--and he has no idea who is targeting him. Darcy determines to find out who is after him and why--before the attacks turn deadly. However, when Darcy searches Mike's apartment, a disturbing discovery makes her question whether she really knows her brother any more...or trusts him." -- From dust jacket.