Aunts Aren't Gentlemen (Jeeves, #15)

The curious case of the Maiden Eggesford Horror

When the doctor advises Bertie to live the quiet life, he and Jeeves head for the pure air and peace of Maiden Eggesford. However, they hadn't reckoned on Bertie's irrepressible but decidedly scheming Aunt Dahlia, around whom an imbroglio of impressive proportions develops involving The Cat Which Kept Popping Up When Least Expected. As Bertie observes, whatever aunts are, they are not gentlemen.