What’s the secret of this unique family?

This is the story of a man, the grandfather of the author, a Jewish doctor who hid in his home in the heart of Paris during World War II. In this "in-between" space carved out of the apartment’s walls, you could neither stand up nor lie down. It went on for two years. He wouldn’t have survived without the iron will and leadership of his wife, "Grand-Mother", a novelist who had had polio as a child. The Bolt hole is the story of an eccentric family and an alternative vision of freedom.
As you venture into successive rooms of the "Rue-de-Grenelle", you meet one character after another and the mystery of the "Bolts" is unveiled.