Having forgotten their 14th wedding anniversary the year before, Basil decides to throw a small party with friends to celebrate their 15th. He pretends to have forgotten and a hurt Sybil decides to walk out, seriously questioning the future of their marriage. Rather than tell the guests what has really happened, he concocts a tale that she is ill. When they insist on seeing her, he pays Polly to impersonate her. It all seems to work - until Sybil walks into the hotel.
—garykmcd