This poignant one-hour documentary follows 18-year-old Josie Bellerby, a gorgeous, fun-loving, typical teenager except for one thing: Her mum carries a hereditary gene that has cursed their family for generations, killing her great-grandmother and her mother.

There is a test that tells you if you have the gene. Josie's Mum Julia was one of the first in the UK to take it a few years ago. She proved positive, and decided to have drastic surgery - to remove both her breasts.