> The reader must have equal opportunity with the detective for solving the mystery. All clues must be plainly stated and described. Many TV shows fail on this

> The reader must have equal opportunity with the detective for solving the mystery. All clues must be plainly stated and described. Many TV shows fail on this point trying to surprise the viewer with an unexpected result which ironically becomes so common that ends up being predictable from the first few minutes of the show. Edit: they also fail in number 2 and 5.