Mermaid Books in Order

Mermaid starts with a question that sounds almost simple, what if a teenager's obsession with mermaids is not an obsession at all, but a clue. The series follows Tessa as her curiosity about the sea, her past, and her own identity begins to crack open a much bigger story.

The first book has that early discovery energy. A girl who thinks she is ordinary starts spotting patterns, secrets, and connections that make her old life feel smaller by the page. By the second book, the scale has shifted. Tessa has spent years beneath the sea, the waters themselves are under threat, and returning to land means facing a world that did not wait for her to come back.

That change gives the series a different shape from a straightforward romance. There is still love and emotional tension, but the bigger pull is identity, belonging, and what happens when two worlds need something different from the same person. Pollution, power, and an enemy who keeps pushing events forward all raise the stakes.

Sea stories always have a little ache to them.

Readers who like YA fantasy with hidden heritage, underwater lore, and a heroine trying to protect both herself and her world should enjoy what this series is doing.