One day in the 1950s, in the little town of Siren's Rock, two young girls begin a lifetime of friendship. As they grow up, starstruck Jemma gives them both movie-star names: she is Sophia Loren (dark, vivacious and sexy) and her friend Helen is Julie Christie (pale, quiet and clever). Together - and apart - they discover boys, first love, husbands, children and careers. Their lives take them to Europe, to Sydney and back home to Siren's Rock. Through it all their friendship never wavers. But can Jemma ever live up to her own ambition? And can Helen ever confront the dark secret she carries inside? When tragedy strikes, their friendship is tested as never before. Are some things just too hard to share, even with your best friend?