It’s that time of year again, when ghouls and goblins come asking for treats at the doorstep. Scary movies are plentiful, too. Over on the Pottermore Facebook page, curious things have been going on. It seems JK Rowling is cooking up a treat for Harry Potter fans. Or is it a trick? We’re not certain, but a series of clues and riddles hidden in plain sight suggest something significant is coming tomorrow, possibly a new revelation in the new Harry Potter story.