Here's the plot according to Wikipedia:
The small New England town of Blithe Hollow comes under siege by the undead. Only a misunderstood local boy, Norman Babcock (voiced by Kodi Smit-McPhee), who has the ability to speak with the dead, is able to prevent the destruction of his town by a centuries-old witch's curse. He'll also have to take on ghosts, witches, zombies, and (worst of all) moronic grown-ups. But this young ghoul whisperer may find his paranormal activities pushed to their otherworldly limits.
Nike has also created a Twitter contest in which the user has a chance to win a pair of the ParaNorman Foamposites if they tweet a picture of a weird kid doing something weird.