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The extraordinary story of the first monarch in British history to voluntarily give up his throne.
The year is 1936 and Europe is in the grip of Adolf Hitler. In the UK, the Royal family is also in turmoil as the Duke of York reluctantly inherits the Throne and his duty as Britain's war time King.
They are the Royals destined to serve but not to inherit: they are the Spare Heirs.
From Margaret to Andrew to Harry they are the rebel royals who seem to be searching for a purpose to their lives.
It's 1982 and the dawn of the computer age when Prince William is born. He will one day be King but will that day be sooner rather than later?