WHEN NEEDED, WILL SHE BE ABLE TO RISE TO THE CHALLENGE?

1945, Connecticut. A scandal breaks which forces a baffled Rose, aged four, and her mother to leave America and return home to England.

The following May, a sister is born - Joanna or "Jon". Rose and Jon are like chalk and cheese. Jon is vivacious, fun, impetuous, rash and persuasive. Rose is reserved, steady, sure, reliable and... ordinary. It is her lot in life to hold the family together through times of tragedy and emotional upheaval.

But, when, years later, Jon sets events in motion which send Rose across the Atlantic again and into the most extraordinary event of her life, can she ever be thought of as ordinary again?