When Steve Luxenberg's elderly mother remarked to a doctor that she once had a sister, a secret long-held started to unravel. Luxenberg, an award-winning journalist at The Washington Post, used his investigative skills to uncover and understand why his mother hid the existence of her younger, disabled sister who was committed at age 21 to Detroit's Eloise Hospital. Luxenberg's talk is based on his resulting book, Annie's Ghosts: A Journey into a Family Secret, which is part memoir, part social history and part detective story. Entry to Hatcher Library's Gallery in Room 100 is via the Diag side of the building. For information: 734-647-6914.