2. Justice

A son's quest to learn more about his late father unravels a mystery that's baffled US federal law enforcement for over four decades.

It's the go-to Christmas present for the person who already has everything. A gift that promises to tell you who you really are and how you're connected to the world. Millions of us have spat into a tube and sent a vial of our DNA to a company like Ancestry and 23andMe. Their tests promise to unlock the truth of our heritage - perhaps even a future foretold in our genes.

Across six episodes, Jenny Kleeman meets the men and women whose lives changed forever after they opened a box that contained a DNA test. Exposing scandals, upending identities, solving mysteries and delivering life-changing news - Jenny investigates what happens when genealogy, technology and identity collide.

Presenter: Jenny Kleeman Producer: Conor Garrett Commissioning Editor: Dan Clarke Executive Producer: Philip Sellars Production Co-ordinator: Gill Huggett Archive courtesy CNN