This is a set of 12 books by Ann Purser. These books would be considered cozy mysteries.
11 of the books are paperback, and one is a hardcover. The titles include:
1. The hangman’s row enquiry
2. The measby murder enquiry
3. The wild wood enquiry
4. The blackwoods farm enquiry
5. Weeping on Wednesday
6. Theft on Thursday
7. Fear on Friday
8. Secrets on Saturday
9. Warning at one
10. Tragedy at two
11. Threats at three
12 foul play at four