I love historical fiction, but of the genre what I love the most is a fictionalised imagining of a persons life. 
Diva focuses on the life of Maria Callas, someone I have to admit that I knew very little about. The bulk of the story centres on her relationship with Aristotle Onassis, interwoven with her career as an established opera singer whose greatest fear is losing her voice. Diva shows Maria as a strong willed yet at times fragile woman. Daisy Goodwin paints a woman who feels real and relatable despite possessing a talent and drive the majority of us could never understand. 
I sailed through this book, highly readable and enjoyable - plus its had me lost in a major Wikipedia rabbit hole!