Piggins and the royal wedding Book

One of a trilogy, I loved these books about the oh so proper pig butler who solves mysteries for his fox employers. Each book begins with an illustration of Piggins climbing the kitchen stairs, and on the next page, an illustration of a cut-away of the Reynard house. In the penultimate illustration, there is another cut-away of the Reynard house, at night, after all the excitement of the day. In the final illustration, Piggins is going back down the kitchen stairs.
In the Royal Wedding, Piggins solves the mystery of the stolen wedding ring.
Jane Dyer's watercolor and colored pencil illustrations were full of interesting details and appealing animals characters.
Even though in picture book format, these stories are all a bit wordy, and so would be best for elementary-age students.