This is a book about two people named Andy and Terry. They both live in a treehouse. Every book, they expand their treehouse by thirteen stories. In this book, Terry buys a pack of Sea Monkeys. The Sea Monkey is actually a Sea Moster. Terry and the Sea Moster (disguised as a mermaid), fall in love with each other. The Sea Monster is just faking, though. She is just trying to get Terry to come underwater with her and drown. When Andy finds out her real identity, he tells Terry. Then, the Sea Moster reveals herself. The Sea Monster chases them. They finally defeat the Sea Moster. There is also gorilla trouble with a giant gorilla. Their publisher, Mr. Big Nose tells them if he doesn't have their new book, he will no longer publish for them. They quickly write a book and send it to him. I really like this book. I highly recommend it.

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