Everyone is having allowance problems: Rocky's Aunt Isabel is prepared to send him a substantial monthly sum, provided he lives life to the fullest in late-night Manhattan, then sends her reports on his doings so she can live them vicariously. Rocky, however, abhors the city night-life and wants nothing more than to live quietly in the countryside. Jeeves takes matters in hand by doing the 'research' himself and writing the required letters, which Rocky forwards to his aunt.
Bicky Bickerstaff is worried that his father, the Duke of Chiswick, will cut off his monthly allowance when he discovers that Bicky is in New York instead of Colorado, as expected. On the advice of Jeeves, Bicky writes, explaining that he's had a successful business venture in New York, and has moved there.
All seems to be going well until both Aunt Isabel and the Duke arrive in New York to visit. Both think that Bertie's flat belongs to their respective relative, and it's up to Jeeves, with the help of Bicky and Rocky, to keep them from meeting. The plan is a success... almost, but due to Jeeves' superior intellect, all turns out well in the end.