I've read silly, funny, puzzling, police procedural and spooky mysteries. But I'm highlighting this mystery because of the way it employs mixed media.
Skeleton Creek, by Patrick Carman, is Ryan's journal. Ryan was in a mysterious accident at the dredge (a mysterious place), and shattered his leg, rendering him housebound. His best friend, Sarah, is still out and about, and while Ryan loves to write, Sarah loves to film. As you hit markers in the text, Ryan will send you to a website: http://www.sarahfincher.com/, where Sarah posts the videos she makes around town. Don't worry, you can't do much with this website unless you also have the passwords, which are sprinkled through the text.
While Ryan does write like a high school boy, the videos are deliciously creepy and the pacing is just right. Don't read (or watch) this at night!
Please tell us what your favorite mystery is!
~ That One Girl