When Tracy Kroh left her Enterline Township, Pennsylvania home on Saturday, August 5, 1989, she didn’t expect to be gone long. She planned to drive to her sister’s home to return a barbeque grill she had borrowed and drop off some coupons she had clipped. But her sister wasn’t home when Tracy got there, so she left the items on her front porch and returned to her car. After that, Tracy was never seen again.

What happened to Tracy Kroh? And is there anything forensic science can do to help bring her family justice?