Meet the doctors, scientists, patients and campaigners tackling the world's worst diseases

We often hear about the dark side of the pharmaceutical industry - from extortionate pricing to the opioid epidemic. But there's another story to be told.

Through the story of eight revolutionary treatments, Dr William Pao cuts to the innovative heart of medical science and celebrates the tireless work of those fighting for better care. Behind each of these medicines - whether a potentially life-saving new treatment for cancer, or something as commonplace as paracetamol - there stands a cast of characters and a wealth of stories.

The trajectory from the laboratory to the local chemist is rarely a straight line. Eureka moments are few are far between. Drug hunting demands leaps of imagination and lateral thinking, the accumulation of the knowledge and expertise of many, and - nearly always - a hefty dollop of luck.

Breakthrough documents these journeys and grants a privileged look at the stories behind the medicines that improve - and very often save - our lives.