Vie de ma voisine (2017) is the true the story of Shoah survivor Eugénie Plocki told through the eyes of her neighbour and in the words of Geneviève Brisac. A life story, it is also a testimonial and a biography. This article examines narrative and linguistic choices that allow Brisac to demonstrate both the limits of her testimonial and her duty to stand witness. It also shows how the biographical pact she has committed to coincides with the birth of a friendship.