Brother and sister Valerie and Joshua Haskell are moving from New York City to Jonah's Harbor, Maine, ostensibly because their dad has a new job in the town.  But it's also a chance for a fresh start, as Valerie has been dogged by cruel rumors at their former school, and Joshua has been kicked out for fighting.  In town, they soon meet star pitcher Jessie, her lovestruck pal Abe, Abe's twin brother Aaron (an Elvis fanatic), their nerdy friend Levi, and Abe and Aaron's little sister, Rita.  Operating with a freedom only '70s kids enjoyed, our cast put together the clues to uncover the sinister conspiracy threatening their town. Their investigation leads them to an abandoned nineteenth-century battle fort, where their final confrontation will take place with an ancient bloodthirsty creature, and it’s minions.