When a family of hikers on the Appalachian Trail comes across the body of an 8-year-old kid, the BAU are brought in.

Joseph Lanham, the father of Daniel, the boy whose body was found, is an early suspect

Daniel was killed right around the time Joseph gave up looking for him.

Garcia helps uncover a string of other abductions up and down the trail, however.

The area of abductions and dump sites has been contained to a 30-mile area in Pennsylvania.

The team theorizes that the abductor suffered some kind of injury, and isn’t in good enough shape to hike far.

The cases shifts into overdrive when young Ana and Robert Brooks, 9 and 10, are taken from their campsite.

The team finally tracks them down to an abandoned coal mine in the hills.

Robert devises a plan that allows his sister to escape, but the UnSub takes him to a nearby town.

The BAU track Shane to the house of drug dealer and pedophile Brandon Hayes, to whom he has traded Robert for a supply of painkillers.

They recue the child, but Shane eludes capture and escapes back to the trail.