In this last episode, as Jenny's own results land in her inbox, she hears how at home DNA tests have brought family secrets - once thought long buried - out into the light.

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 GarrettCommissioning Editor: Dan ClarkeExecutive Producer: Philip SellarsProduction Co-ordinator: Gill Huggett