An unexpected visitor appears to the elderly Sir Paul McCartney—a woman unknown to him, seemingly from an ethereal realm, named America Zami. She reveals to McCartney that his life unfolded differently in another universe. Simultaneously, two more parallel narrative threads unravel: the daughter of Paul McCartney and America Zami from that very other universe uncovers the ancestral secret of her mother's lineage, while in the depths of Hell, questions of life and death are being decided...