The heist at niagara falls : agatha: girl of mystery series, book 4

The fabulous, jet-setting mysteries continue with hip and headstrong Agatha ready to solve the case! Agatha and her cousin Dash have been summoned to Niagara Falls. Priceless jewels have gone missing from the hotel room of a famous opera singer—it is believed to be the work of Canada's most notorious thief, Ratmusqué. Will Agatha be able to solve the mystery? Agatha Mistery, a twelve-year-old detective with a photographic memory, and her cousin Dash are summoned to Niagara Falls to investigate a jewel heist