In a four-part docuseries, cold case expert Paul Holes joins former law enforcement officials, citizen sleuths, district attorneys and victims themselves to present fresh perspectives on a crime spree that has affected Californians for generations. The investigation into the person responsible for raping more than 50 women and killing 10 people dates back to 1974 and remains open to this day. Exploring 40 years worth of evidence, Holes uncovers new leads by focusing on advanced DNA technology and using audio analysis and geographic profiling. The series also features insight from survivors, friends and family of victims, and detectives past and present.