In 1981, two musical legends gather at a Scottish cottage on the Mull of Kintyre for a tense summit surrounded by the smell of breaded vegetarian food and the whiff of a potential Global Smash hit single.

John is a touring jazz musician who has never met a woman like Alice. That's because there aren't many women like Alice. Their love is urgent and physical and they have made heady declarations of their devotion to each other. Blowing...