The Spy Who Drank Blood is an interesting fantasy/horror/mystery type book from the mid-80s. As you can probably guess from the title, it's about a secret agent who is also a vampire. Since the book is from the 80s, it isn't one of those lame sparkly vampires, or a tragic, brooding antihero, or the love interest of some woman who secretly battles the forces of darkness. Being the protagonist means he isn't a crazed monster either, but he is more interesting than these pathetic vampires that infest the genre today.
Blood, as the hero is called, is a vampire mostly in the traditional mold; he drinks blood, casts no reflection, can turn into mist or a bat or a wolf, can control certain animals, has hypnotic eyes, and can't cross running water. He works for a secret government agency called the Office.
His boss's daughter is a reporter for a supermarket tabloid and is in Florida investigating skunk ape sightings. She gets kidnapped by some domestic terrorists, and then kidnapped from them by the skunk ape. Blood gets sent in to sort the whole thing out.
This book combines action, humor, horror, and a little science fiction very well. If you can dis up a copy of this out-of-print book, you should do so.