Just over four years ago, Paris was the scene of one of the most gruesome terrorist atrocities of recent years.
A series of coordinated attacks across the city claimed the lives of dozens of people. Ninety people were killed in the mass shooting at the Bataclan theatre during a rock concert.
Among them were Lola Salines who was in the audience, and Samy Amimour who was one of the three attackers, and who’d returned from ISIS-held territory in Syria.
Their fathers have come together and written a book.
I went to meet them in Paris.