Jeeves and the Feudal Spirit, chapter 8, Bertie's flat, days after, then one day
Bertie, enjoying a Stilton-free Drones, swaps telegrams with Aunt Dahlia, who orders him to Brinkley to cheer up a whiskered guest and bring her pearl necklace, but he hesitates for fear of Stilton.
The text is on its way.
Aside, earlier A telegram once started the affair of Sir Watkyn Bassett, Roderick Spode and the silver cow-creamer Aunt Dahlia told Bertie to pinch.