Paranormal romance is a literary subgenre of the romance novel. A type of speculative fiction, paranormal romance focuses on romance an included elements beyond the range of scientific explanation, blending together themes from the genres of traditional fantasy, science fiction, or horror. Paranormal romance may range from traditional category romances, such as those published by Harlequin Mills & Boon, with a paranormal setting to stories where the main emphasis is on a science fiction or fantasy based plot with a romantic subplot included. Common hallmarks are romantic relationships between humans and vampires, shapeshifters, or fantastical beings (the Fae, Elves, etc.).