Tales with a Happy Ending

What do you think, who are Hansel and Gretel? What kind of wonder-beast is a griffin? 

Who converses with Shakespeare on an autumn night, and who investigates a sinister crime known as theft?  

Who predicts the weather best, who was actually the Sun King, what secrets does a medieval manuscript from mystical Prague hold, and who is the treacherous and cunning Moriarty? We bet you haven't guessed even once! And you won't guess unless you open this book. And finally, a spoiler: all the stories collected in it surely have a happy ending!