It's 1987, and three schoolgirls contemplate what they will be like at fifty: with so many different paths they could take, limitless opportunities unfurl before them. One warning rings out amid their speculations: be careful who you marry. Halloween approaches, and the Young Farmers' disco with it, a simple night out that changes lives forever. That night, three different choices create three wildly diverging destinies. Lilli never expected that growing up would happen so suddenly, and so permanently - but motherhood has that effect. Quiet, timid Mouse had been happy to stay in the shadow of her brilliant scientist husband, until that shadow started to come apart. Lizzy took a different route. She desired nothing less than the perfect man, only to realise that it is never that simple. Through four decades, the school friends' lives are shaped by choices made on that one night, encompassing friendship, marriage, motherhood, loss and the mistakes we make along life's pathway. Lives collide and coalesce. Love is found and lost, the unexpected becomes the norm as the thin line between joy and tragedy blurs. Choose your path. Find your love. Keep it close. But, above all, be careful who you marry.