"Et si c'était vrai..." is a novel written by Marc Levy, first published in 2000. The story revolves around a young woman named Lauren who, after a tragic accident, finds herself in a state between life and death. She becomes invisible to the living but can interact with Arthur, a man who unknowingly moves into her apartment. As Arthur discovers Lauren's presence, they form a unique bond that challenges their perceptions of love and reality. The novel explores themes of love, loss, and the supernatural, captivating readers with its blend of romance and fantasy.