Melanie Kato takes her young family to Molokai for Halloween and a fun getaway weekend, but a storm is headed in their direction.
Trick or Treat just happens to fall on the akua full moon, the one night nightmarchers emerge from their graves in search of lost souls. When they come marching for the Hawaiian house in which Melanie and the kids are staying, trouble begins, and Melanie finds out how authentic the place really is. When the storm crashes into the house, it brings ghastly beasts and soulless ghosts with it. But when their only friends at the house turn on them, kidnapping part of Melanie's family and holding them for a frightful ransom, she calls in a few spirit favors of her own.
Will they be doomed to walk Molokai on every full moon forever, or will faith, bravery, and magic save their lives?