"The Last Time I Saw You" is a novel by Catherine McKenzie that explores themes of love, loss, and the complexities of relationships. The story follows Diana, a woman who returns to her hometown for a high school reunion, where she confronts her past and the people she left behind. As she reconnects with old friends and faces unresolved feelings, Diana discovers secrets that challenge her understanding of herself and her choices. The narrative weaves together memories and present-day interactions, highlighting the impact of time on friendships and personal growth.