This week on The Reading Life: New Orleans native and art historian Allison Levy, whose new book is “House of Secrets: The Many Lives of a Florentine Palazzo.” Here’s what’s on tap in the literary life this week: Here in New Orleans: Casey Cep discusses and signs “Furious Hours: Murder, Fraud, and the Last Trial of Harper Lee,” Sunday, May 12, at 2 p.m. at Garden District Book Shop. Judith Viorst discusses her new book “Nearing Ninety: And Other Comedies of Late Life,” Tuesday, May 14, from 7-9