This author of The Mysterious Flame of Queen Loana and The Island of the Day
This author wrote a book in which Roberto della Griva lands on an island that is split by the International Date Line. This author of The Mysterious Flame of Queen Loana and The Island of the Day Before wrote about Diotavelli's formulation of "The Plan," which leads treasure hunters to hang Belbo. A book is poisoned in another of his novels that centers on William of Baskerville's investigations at a monastery. For 10 points, name this Italian author of Foucault's Pendulum and The Name of the Rose.
This author wrote a book in which Roberto della Griva lands on an island that is split by the International Date Line.
Umberto Eco