March 1969. In only a matter of months the Americans will walk on the moon and the world will never be the same again. A young man enters the gallery Marlborough Fine Arts in London, which is hosting an exhibition with Oskar Kokoschka. The young man wants to know how much the Austrian painter will charge to paint a portrait of his grandmother. 

His grandmother turns out to be the world famous mystery author Agatha Christie and the portrait will be a gift for her 80th birthday. The two ageing artists reluctantly agree to the project and during six sessions they forge an bond, reveal the fears and desires that shape a creative life. It becomes a conversation about death, love and art - in whichever order you choose.