From the beginning it is clear...

THE TOWN IS NOT THE PARADISE MOM AND DAD REMEMBERED FROM THEIR TEENAGE YEARS.  IT IS PRACTICALLY DESERTED—EXCEPT FOR THE STRANGERS IN A WHITE VAN WHO KEEP FOLLOWING THEM.  THE MANSION THEY’RE STAYING IN MIGHT BE HAUNTED.  A MYSTERIOUS GIRL LIVES UPSTAIRS AND THERE ARE RUMORS OF A SEA MONSTER.  WHEN MOM AND DAD JOIN THE LONG LIST OF MISSING PEOPLE, IT’S UP TO ALISON AND OLIVIA, ALONG WITH ALISON’S BIG BROTHER MICHAEL, TO SOLVE THE MYSTERY OF CAPE NOVEMBER TO SAVE THEM, AND MAYBE THE WORLD.