On August 4, 1986, a young girl took a bike ride through Point Defiance Park near Tacoma, Washington. She never returned home. Investigators conducted a desperate search but came up empty handed. The case went dormant for decades and eventually ended up on the desk of cold-case detective Lindsey Wade. Through the application of emerging DNA testing and hard work, Wade and her fellow detectives were finally able to piece together what happened that day and bring closure to the family.