Like opening Pandoras Box, the opening of an envelope containing a twenty year old newspaper clipping sucks Tennessee Sheriff Tony Abernathy into the mystery of three murders, long gone cold.
Thus begins the longest week of his life. His search for answers about the cold case is entwined with the lives of oddball characters that reside in this normally quiet mountain area. Tourists arrive. Work piles up. Yard ornaments are abducted at an alarming rate. (your hook starts here) Queen Doreen, the mayors wife, is murdered and her body left at the fledging museum organized by Tonys mother and aunt. Her corpse is covered with an antique quilt known prophetically as The Murder Quilt. As he sifts through the facts, Tony solves one problem only to have two more take its place, each more serious than the last.
Be specific about those problems (that's where you can bring in the envelope but you need to be specific about what's in it). The nice thing about a sherrif as a character is we know he has to solve the crime; it's his job. We also need to see some cost to him if he doesn't and not just job-wise.
We also need a sense of an antagonist.
Make sure you keep the lawn ornament line when you revise. It's hilarious.