I just think you shouldn't put people on pedestals that's all. It makes them seem perfect when they're not.

Martha McDonald was a world-famous singer - Grammy Hall of Fame resident, poster girl for revolution, and writer of one of the most iconic songs of the 1970s. Until she disappeared.

For many years she hasn't written or sung a single note. Hidden from public view deep in the Californian Mountains, Martha guards a secret that, if revealed, will change everything. And only one other person holds a key to this enigma: her estranged daughter, Anna.

Anna is...