One of the very first books I reviewed here on The Compulsive Reader was Cathy's Book--a very interactive mystery told in journal format, accompanied by an envelope of clues and evidence--notes, napkins, maps, newspaper articles, documents, drawings, you name it! There were phone numbers to call, and websites to visit, and it was awesome! Since then, there have been two sequels, Cathy's Key and Cathy's Ring, written in the same style.
Well, Cathy's Book came out more than two years ago, and since then, an Apple app (for iPhone and iPod Touch) has been developed to go along with the stories! Awesome, huh? Check out this video to learn more!
You can also learn more at cathysbook.com! I hope you check out these books--they're really unique and quite unlike anything I've ever seen before!