Mermaid plus Vampire is equal to?

"They looked exactly like how they were described on books."

That was the first thought that crossed Audrey's mind the moment she laid her eyes at what was waiting ashore. In her opinion, there was no way that they were not mermaids. In the world where she came from, mermaids were nothing but a work of fiction. However, in this magical world, she saw them in real flesh and at first, she thought that it was amazing......until she saw one killed a man.

Mermaids were known through all manner of legends and lore. Basically, they were mythical aquatic creatures with the head and upper body of a female human and the tail of a fish as well as a long cascading golden hair; half woman, half fish, these lethally-minded sisters of the sea would rise up from the waves every now and then to lure men into their arms. Beautiful, conniving, and dangerous, mermaids would do anything to protect their homes. Which happened to be the same body of water that they disturbed when the cruise