The series plot is centered on a mermaid, Nikki, who is rescued by a young man when she washes ashore in Miami. Her savior, Matt Johnson, is a lawyer living with a roommate and engaged to the daughter of his boss. Initially, he is in utter disbelief of Nikki's nature, until it is proven true. According to the series mythology, mermaids are a race of creatures whose evolution took place underwater. The mermaids originate from a sunken city and have supernatural abilities, including superhuman strength and agility, as well as being able to see in the dark, read emotions and have a connection with other sea creatures. However, another race of creatures who began their existence underwater, but have since adapted onto dry land, include Eric Luger who is hunting Nikki. Nikki, meanwhile, attempt