Death of a Cozy Writer by G.M. Malliet
In ten words or less: Mystery writer threatens to disinherit children; who did him in?

Review: Millionaire mystery writer Sir Adrian Beauclerk-Fisk threatens his four adult childen with disinheritance on a regular basis. One day each of the children receives a garish invitation to their father's upcoming wedding to a woman named Violet. They imagine her as a young gold-digger, but much to their surprise she is an attractive, cultured woman of their father's age. And they are already married! What is their father up to?

Why bother? A mystery in the manner of Agatha Christie--which member of the assembled party at the manor house is the murderer? A teriffic page turner!