Miss Mallard organizes a costume charity ball at Neuduckstein Castle in Bavaria. Willard accompanies her to guard the donations, and it doesn’t take long for mystery to strike. It is said the ghost of a court jester haunts the castle and it looks like it’s responsible for the hauntings that plague the ball. Miss Mallard soon realizes there’s more than one ghost responsible for the hauntings, and she and Willard set out to prove who’s the real ghost of Neuduckstein Castle.

梅小姐作为慈善基金会的主席在德国巴伐利亚地区一座雄伟的新天鹅堡里组织了一场化装舞会，为全世界贫穷生病的鸭子募捐。由维乐负责保卫工作。主人尖尾鸭爱米丽热情地款待来宾，心里却很难受。她的经济顾问公鸭男爵说她欠了银行一大笔钱，必须卖掉这幢古堡还债。买主沃纳和公鸭男爵踌躇满志，没落贵族鹅伯爵夫人忿忿不平。气氛不太友好，但舞会还是很成功。梅小姐募捐到了一大笔钱。怪事也跟着来了。杯盘食物满天飞，阴风乍起，门窗紧锁，喷水池发疯般四处喷溅，募捐款不翼而飞……古堡里响起一阵阵狂笑，是那个传说中的幽灵伯爵出现了吗？来宾们惊恐万状。梅小姐发现古堡里不光有传说中幽灵伯爵爱吃的发霉的巧克力，还有新鲜的巧克力，一定是谁在假扮幽灵伯爵吓唬大家，而且假扮伯爵的还不只一个。真相大白，可来宾们刚松了一口气，古堡里又响起了恐怖的笑声。