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The Mixed-Up Files of Mrs. Basil E. Frankweiler meets Harriet the Spy in this middle-grade historical fiction novel inspired by the real life of Viviani Joffre Fedeler, born and raised in the New York Public Library.Eleven-year-old Viviani Fedeler has spent her whole life in the New York Public Library. She knows every room by heart, except the ones her father keeps locked. When Viviani becomes convinced that the library is haunted, new girl Merit Mubarak makes fun of her. So Viviani decides to play a harmless little prank, roping her older brothers and best friend Eva to help out.But what begins as a joke quickly gets out of hand, and soon Viviani and her friends have to solve two big mysteries: Is the Library truly haunted? And what happened to the expensive new stamp collection? It's up to Viviani, Eva, and Merit (reluctantly) to findout.