<p>Saffron struggles with seasonal affective disorder (SAD) and is dreading autumn and winter. She took time off in her first year at university and can't afford to do the same this year if she's going to achieve her dream of being an astrophysicist. She's managed to keep it a secret from her friends ? fearing that they won't want to spend time with her if they see her at her lowest - but it's getting harder. Especially when she meets Nell.<br><b...