Bernard Madoff's decades-long fraud might not have been his only secret. A new book says he had a two-decade affair with one of his investors. That's in a memoir by Sheryl Weinstein titled “Madoff's Other Secret: Love, Money, Bernie, and Me.” It goes on sale Aug. 25. A spokesman for book publisher St. Martin's Press said Friday the relationship between Weinstein and Madoff spanned more than 20 years. Both were married. Madoff is serving 150 years in prison for defrauding investors. Weinstein says she met him when she was chief financial officer for the charitable women's organization Hadassah. Madoff attorney Ira Sorkin says he hopes the author “was more discreet with her investment obligations than she has allegedly been with her sex life.” An attorney for Madoff's wife, Ruth Madoff, says his client didn't know about the “alleged affair.”