Donald Duck #34/1967

When Scrooge Duck unveils his new vault—accessible only by playing "My Bonnie Lies Over the Ocean" on a fife—he sends the tune soaring into the depths of the Cathedral of Notre Duck’s wishing fountain. But when the fife vanishes and a mysterious black-clad figure begins playing the same tune, Donald, Scrooge, and the nephews Kwik, Kwek, and Kwak find themselves chasing shadows through ancient stone halls. With the cathedral closing in around them, the chase turns into a trap—and the real mystery has only just begun.