Summary: Before meeting Roy Chappel, a prospective client, at the country club, Samantha tells Darrin that their new baby sitter, Elspeth, is a witch who was once her nanny. Darrin is upset until Endora arrives and threatens to hex him for displacing her as baby sitter. Elspeth, a jolly cockney, stops her and wins Darrin over. At the club, Larry warns that Chapppel, a self-made man, wants an aggressive executive to handle his account. Endora arrives with Lord Montdrake, an ancient British warlock, Elspeth's former employer. Furious that Darrin has stolen Elspeth, Montdrake gestures at him. Larry has trouble explaining why his hard-driving executive has a rose in his teeth. At home, the Stephens scold Elspeth for not telling them she worked for Lord Montdrake. Elspeth loves the Stephens and plans to stay on with them.
At the office, Larry orders Darrin to show his tough side. Again Lord Montdrake gestures and Darrin finds himself in a Lord Fauntleroy suit. When Elspeth refuses to go home with Lord Montdrake, he traps Darrin inside a mirror. Samantha finds that Lord Montdrake is a lonely old man, who needs Elspeth for company. Using magic, Samantha turns Castle Montdrake into a tourist attraction, full of ghostly thrills. Excited by his new business, Montdrake decides he doesn't need Elspeth and frees Darrin from the mirror. Elspeth convinces Chappel that Darrin is a great individualist and he gives Larry his account. Elspeth vanishes as Samantha kisses Darrin.