"On discovering them, Cassandra is overwhelmed as she is transported back to her youth. In flashback, we meet Young Cassy and Jane as they navigate the infatuations, family feuds and dashed hopes which shaped their lives and laid the foundations for Jane's unforgettable stories. Cassandra's re-evaluation of her past eventually leads her to realise how blind she has been to the real cause of Isabella's heartache and distress. Finding a way to guide Isabella towards true happiness, Cassandra is finally able to understand and celebrate the sacrifices she chose to make for her brilliant sister, Jane." -TVmaze