Messages to the Reader from Vampire Novels?

Many people might not believe that a vampire novel could send a message to the reader but many of them do. Stories like Dracula, Carmilla, the Giaour, and Northanger Abbey send messages to the reader. They send messages to the reader like be careful with who you trust and to guard your heart. All of these books can send valuable messages and teach life lessons. They may be 19th century novels but they can help with 21st century issues.