The Invisible Thread

The search for a mysterious family secret that has its origins in WWII.
The reconstruction of the true role of a XXth century female scientist, Rosalind Franklin.
 
Doubts haunt Júlia, a woman in her early thirties. Does she love her husband enough? Is she really prepared to be a mother, even if she's not really willing to? Will she find the time to finish her script about the true role of scientist Rosalind Franklin in the discovery of the double helix of the DNA?
To escape from so many uncertainties, Júlia accepts the invitation of her French family with whom she's never been in touch before to spend a whole month in Batz, an island on the French Breton coast. There, in the old family house, on the seashore, an imposing great-grandmother who's turning 100 this August awaits her.

Thanks to Júlia's observation habillity, she catches an enigmatic detail in some old photographs that date back to World War II. 

What was supposed to be a family vacation soon becomes a research about Júlia's own origins, which contain a dark secret, jealously guarded by Júlia's centenarian great-grandmother.