The Castafiore Emerald (French: Les Bijoux de la Castafiore) is the twenty-first volume of The Adventures of Tintin, the comics series by Belgian cartoonist Hergé. It was serialised weekly from July 1961 to September 1962 in Tintin magazine. In contrast to the previous Tintin books, Hergé deliberately broke the adventure formula he had created: it is the only book in the series where the characters remain at Marlinspike Hall, Captain Haddock's family estate, and neither travel abroad nor confront dangerous criminals. The plot concerns the visit of the opera singer Bianca Castafiore and the subsequent theft of her emerald.



https://en.wikipedia.org/wiki/The_Castafiore_Emerald