When the DNA of a boy who went missing in 1995 is discovered at a murder scene, the lives of four friends are turned upside down in a desperate search to solve the unsolved mystery from their past.

Pru helps Mark dig for information and ends up unearthing some dark secrets. Elsewhere, Danny and Ally are perplexed when they find another body while, at the shelter, someone's past is about to catch up with them.