A decade ago, scientists announced that they had produced the first draft of the human genome, the 3. 6 billion letters of our genetic code. It was seen as one of the greatest scientific achievements of our age, a breakthrough that would usher in a new age of medicine. A decade later, Horizon finds out how close we are to developing the life-changing treatments that were hoped for. Horizon follows three people, each with a genetic disease, as they go behind the scenes at some of Britain’s leading research labs to find out what the sequencing of the human genome has done for them – and the hope this remarkable project offers all of us.