Ka-ching! That's all super sleuth Roxy Hunter hears when she finds out about a newspaper contest that will pay $300 to the winner who writes the best story. The trouble is, she doesn't have one! Then, like magic, a mysterious young girl arrives out of the blue with nothing, literally. No words, no memory, nothing! Roxy names her Annie Nonymous and sets off to solve the mystery of the girl's missing memory. When Annie comes home soaking wet several nights in a row, Roxy realizes the biggest clue to her super story, Annie is really a mermaid who desperately needs help to get home!