Margo MacDonald, the firebrand, independent politician, is one of Scotland's most popular public figures. But she also has Parkinson's Disease and, earlier this year, she spoke openly of her desire to choose the moment of her death.

Now, in this deeply personal film, she uncovers the truth about assisted dying, meeting those with illnesses like hers who are desperate to die, and exploring how British law could be changed to allow them to choose when they can.

And she investigates the underground suicide movement in the UK, uncovering shocking evidence of "suicide hoods", and powerful veterinary drugs being used illegally.

In a moving interview, her life-long friend and leader of Scotland's Catholics, Cardinal Keith O'Brien, tries to persuade Margo against taking her own life.