Pandora Schuster is about to turn thirty but that's the least of her worries. In Dublin she has just been tested for a hereditary family illness and, expecting the worst, is desperate for her ex-boyfriend and father of nine-year-old Iris to be a part of her daughter's life. There are two major problems: Olivier Huppert lives in Paris and he has no idea that Iris even exists. So when Pandora secretly tries to find Olivier during her Parisian birthday weekend, it all ends in disaster.

As the agonising weeks until her test results crawl by, Pandora manages to find some distraction with her kind and sensible boyfriend, Declan, and with her fellow Shoestring Club members as they time-share a fabulous new designer dress. Yet matters of the heart are not easily forgotten and Pandora is determined for Iris to know the truth about her handsome, charismatic father. So she creates a memory box filled with photos, letters and mementoes of the magical time she spent with Olivier in Paris.

But when the past and the present start to collide Pandora finds herself having to choose between her head and her heart . . .