A fast moving cozy hardly worth the money that trade sizes require. Alas, the loss of paperbacks really makes you look at the worth of a book. The plot and setting were good, the writing itself leaves a lot to be desired. First, the alterative names Posie Parker, Felicity Fyne, are reminiscent of Stan Lee's, Peter Parker and Reed Richards. A comic book trick in an adult novel seems to stick out.
Second, the protagonist had a very limited vocabulary, using words like golly, which were too young for the character, and not very professional. And her "bread is bread" remark became redundant by the end of the book. In general, the writing was prosaic, with the same adjectives being used in two sentences in a row, and whole paragraphs with every sentence starting with the same word. Many words were jarring, and seemed out of sync with the times. For example near the end, Posie tells the blackmailer to stop "hassling" her victims. The word form hassling did not come into common usage until the 1940's according to Webster's.
There was never any real danger, and events seemed to fall synchronistically together. In summation the book was trite, and a waste of money.