Once Upon a Midnight Eerie

In The Tell-Tale Start, Edgar and Allan Poe (great-great-great-great-grandnephews of the legendary Edgar Allan Poe) managed to outwit the nefarious Professor P. Pangborn Perry, who was (and is) determined to kill just one of them, in order to prove a mad scientific theory. Now the boys are in New Orleans, about to play the young Poe in a feature film. But the role may cost them their lives, because now someone else wants them dead. But who? And can the twins -- with the help of their co-stars, Em and Milly Dickinson, their ghostly forebear, and a pair of real ghosts -- manage to outwit them?