The first time Joe plays Percy one of his songs in his college room in 2000, she instantly realises three things:
One, she is watching a star in the making.
Two, she can shape his music into something extraordinary.
Three, she will always be on the sidelines.
She swallows her jealousy and throws herself into collaboration, transforming Joe's songs into indie hits with her blistering critiques.
But there's an undercurrent to the music they're making - something undeniably electric, hurtling towards love. And then, almost inevitably, towards heartbreak.
As Joe steps into the spotlight, can Percy bear to watch on in silence?
And can he exist there without her?