From Samuel French:

Psychiatrist Victor Karleen is financially pressed between the rental of his posh office apartment and his fiancee's expensive tastes. A colleague has written a best selling case history book and is now rolling in royalties. Good friend Parker Donnelly has rejected Victor's similar work because the public is tired of such things and prefers torrid fiction. Needing cash, Victor reluctantly takes on a new patient who, due to love frustration, is grinding out a rip roaring sex novel. By mistake, his nurse gives the patient's manuscript to Donnelly believing it to be Victor's work. Suddenly Victor has an enormous advance royalty check, a Book of the Month Club selection and a potential Pulitzer prize. When he discovers that it is his patient's inviolate confidences and not his clinical casebook that has saved the day, Victor determines to keep his patient crazy until he dreams up the final chapter. It's fast paced, hilarious and zany.