Eager to grow up, Abby Jensen (Debby Ryan) has been planning for her Sweet 16th birthday party ever since she was a little girl, with a list of secret wishes she wants to come true. When the big day finally arrives, she excitedly adds her 16th and final wish to the secret wish list she’s been keeping. Then begins the first of many unusual occurrences, each including visits from a peculiar woman, Celeste, whose first appearance is as an exterminator to get a colony of one thousand wasps out of her house.