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.

Mark’s head is sent into a spin when Slade reveals a very dark secret. Danny makes a breakthrough in the case after finding some missing evidence but is forced to question his own part in Jesse’s disappearance when he receives a few home truths.

Julie and Alan's relationship is put to the test after they are burgled, while Danny is forced to make a difficult decision in order to save his marriage. 

Danny and Mark go it alone. But just as they think they're getting close to the truth, Mark discovers some devastating news that makes him question everything.

Mark prepares to finally face up to the truth about Jesse.