Robin Burcell has worked as a cop, hostage negotiator, and as an FBI-trained, forensic artist . She's also the author of award-winning thrillers. Now she uses that unparalleled experience to continue Carolyn Weston's groundbreaking series of books, which were the basis for the hit TV show "The Streets of San Francisco."

Sgt. Al Krug and his younger, college-educated partner Casey Kellog are investigating a string of strangulation killings when another victim is found at the Presidio...but a surprising, violent incident at the crime scene makes them wonder if everything is what it seems....