A tale of love, power, infidelity and tragedy, O Jackie recounts a pivotal moment in the lives of three icons of the 20th Century, Jacqueline Kennedy, Aristotle Onassis and Maria Callas. Set in 1968 on the small Greek Island of Skorpios, the 'wedding of the century' is about to take place between the former First Lady and the hugely wealthy shipping tycoon. What starts off as a pleasant and civilised celebration soon descends to something more chaotic where passions bubble to the surface, secrets are revealed and the true nature of this iconic marriage becomes apparent.