I have always loved murder and blame this predilection on the fantastic Edward Gorey opening credits animation for Masterpiece Theater/Mystery!.
PBS has since gotten a little too modern and they've screwed with the animation, but I will let it slide as long as they keep showing Agatha Christie inspired shows.
Mysteries are my favorite summer companion.
If you pretend you are 80 like I do and can handle 1.5 hours of period piece British murder while you sip Damson Gin and knit an afghan I hope you are watching PBS on Sunday nights for the next few weeks. I am not quite on board with the new Marple (Geraldine McEwan was perfect) but I do enjoy watching Poirot's mustache. There's a young guy at my grocery store that has the same moustache, but he doesn't seem to be solving any crimes, although I haven't out-and-out asked him... those links above take you to full episodes of the last Marple and Poirot so you can watch online. Nice.
If you want to laugh your patoot off with a bit of mystery, two book series that are fairly bloodless and terrifically funny are the Izzy Spellman books and the Gilda Joyce books.
Lisa Lutz is totally tubular and taught me how to almost* tail someone I failed because I saw a candy store en route :(
The Spellmans came with me on my honeymoon, they are that wonderful and I love love love each book and am ready for the next.
Gilda Joyce was recommended a long time ago by the fantastic Gayle Richardson. I can't believe these don't get more buzz. Gilda is incredibly hilarious and I'm so glad there are more books in the series to look forward to.