Where There's a Will — Anne Burton

She changed her will at 7 pm. By 10 pm she was dead... When the body of Maureen Ross, a retired actress worth millions, was found in her bed, suffocated with a pillow, Scotland Yard arrested her grandson, Kevin. After all, he would have inherited her estate if she hadn't suddenly cut him off without a penny.
Then Richard Trenton was asked to investigate on behalf of Kevin's bank. Trenton didn't think Kevin was the murdering kind. There were other heirs who could have benefited from the old lady's death - but which one?
Then the wife of one of the other heirs turned up dead.