With the Duke of Dunstable trying to steal his pig to sell to Lord Tilbury, mischievous Church Lads camping in his park, his sister Constance bossing him unmercifully, and Lavender Briggs, his secretary, making life miserable, Lord Emsworth has little time to concentrate on the invasion of Blandings Castle by yet another imposter. But Bill Bailey, aka Cuthbert Meriwether, has inveigled himself into the castle to be with his beloved, Myra Schoonmaker, who is staying there under the eagle eye of Lady Constance, and Lady Constance is determined to thwart him. In the end virtue conquers vice: the lovers are united, Dunstable defeated and Tilbury trounced, but only through the brilliant plotting of Frederick, Earl of Ickenham. Everyone is happy who deserves to be, none more so than Lord Emsworth who at one fell swoop is freed from the tyranny of a duke, a secretary and a sister.