“The Life Before Us,” a novel by Romain Gary (under the pseudonym Émile Ajar), tells the story of Momo, a young Arab boy, and his caretaker, Madame Rosa, a Holocaust survivor and former prostitute. Momo, left in Madame Rosa’s care by his mother, a prostitute, becomes her devoted companion. The story unfolds as Momo and Madame Rosa, along with their diverse community of immigrants, navigate life’s challenges, particularly Madame Rosa’s declining health and fears about being hospitalized