Nine and a Half Weeks: A Memoir of a Love Affair is a 1978 memoir by Ingeborg Day, first published under the pen name Elizabeth McNeill. It details the brief, sexually violent relationship between an art gallery owner and a Wall Street broker – based on Day's own experiences. The memoir was famously adapted into the 1986 erotic drama 9½ Weeks, starring Kim Basinger and Mickey Rourke. Source: Wikipedia (en)