The mystery theme for this Monday is CAT. I am not particularly a cat fan myself but have read some mystery books that feature cats in them. One of my favorites is a series by Leann Sweeney.
Here is a list of some mystery writers who write these books and their cats.
From MysteryBookCats.com http://www.mysterybookcats.com/bookindex.html
From Cozy-Mystery.com http://www.cozy-mystery.com/blog/kittens-cats-and-cozies-cat-mysteries.html
From The Readers Advisor The Readers Advisor
By the way, if you have suggestions for themes I would be open to them!!!