Halloween brings excitement and thrills as Angelina and her best friend Alice craft glorious firefly costumes complete with delicate wings and sparkling tiaras. Angelina's little sister, Polly, desperately wants to be a pretty firefly too. However, Angelina insists Polly is simply too little and clumsy for such a delicate outfit. Instead, Polly settles for dressing up as a spooky ghost. As the friends head out for a festive evening of tea parties and goblin biscuits, Polly unexpectedly wanders off into an old, creaky house. Her ghostly disguise ends up giving Angelina a real fright. After the surprise scare, the sisters are safely reunited. Angelina realizes how much she loves her little sister and promises that next year, they will both wear matching firefly costumes.