What is the main conflict in The History of Love by Nicole Krauss?

The History of Love by Nicole Krauss intertwines romantic and mysterious elements into a story about love, loss, and identity. Structured as a book-within-a-book, the novel explores the impact that one supposedly lost manuscript has on the lives of several people. Through reading the fictional book, also titled The History of Love, the characters begin to define and refine their own personal histories of love.