Seventeen years ago, three women were killed, their bodies dumped in the wasteland of the L.A. River. The serial killer was never found, and the case was mysteriously closed. Now, all these years later, Detective Alex Delillo reopens the River Killer case to help solve her own brother's murder. Alex never knew she had a brother until she went to identify his body. He was found next to the river near Griffith Park, a single gunshot wound in his head...