Michelle Moklebust's second book retains the charm and strong focus on female lead characters that served her so well in her first novel (2012's Ghost Whispers) and builds on them. What Riptide main character Dani shares with Ghost Whispers' Alexis is a trait of indeciveness (in decisions of love and day-to-day matters) that inhibits her ability to discern what's really going on around her until it's too late. In most other respects, Dani is a new, and to me more engaging, character: unlike Alexis, Dani shows no fear as the supernatural (in this case, the mer-people of what used to be Atlantis) begins to interact with the mundane (the surface world); she dives right in (pun intended) when love and lust aren't throwing big old distractions in her way.
Love and lust come in three forms: Dani's current (as the novel starts) emotionally (and eventually physically) abusive boyfriend Reese; new beau (with a secret: her's a merman!) Max; and Max's cousin Thomas (who just happens to be a Prince). Dani questions each relationship (or potential relationship) multiple times in the course of the novel, which clouds her perception of the bigger picture. Of the three, Reese is the least developed and most stereotypical: a jock who thinks he can do no wrong and is the king of the school's football team. Thomas also comes across a bit one-note: the womanizer who can't help but compete with his cousin on all levels. Max is the most fully realized of the male characters and is clearly, despite various set-backs, the man for Dani.
The bigger picture that Dani is not seeing is a combination of socio-political machinations for the People of the Sea (including Arranged Marriages for Max and Thomas and a mysterious artifact that needs to be hidden) and the impact of the surface world learning of their existence. Dani's mother is a marine biologist with a stake in uncovering the truth of the "mer-man" that was captured and given into her aquarium's care until federal armed forces take over. The two "big picture" issues begin to dovetail nicely into each other as the novel draws to a close.
One plot point I'm still not clear on is the method by which the mer-youth (who can transform to a "human" phase with legs and lungs) become enrolled at New Atlantis high school. The novel is set in the not-too-distant future on a land-mass that has risen in the Atlantic after the climate change crisis has sunk a good portion of the continental United States and Canada. One would assume that current identity and background checks, health records and the like, will be even more stringent in 30-50 years than they are now. The rest of the novel's world is so well-realized that this one point stuck out to me: how have all these mer-people, with no surface history, managed to become such a part of this school's social fabric in so short a time? Perhaps the author will explore this in the second book, although the cliffhanger ending of Riptide heavily implies that, like the final volume of the Harry Potter saga, the school is about to take a back-seat to more wide-ranging adventures.
Despite my dislike of major cliffhangers as endings for books in a series, I have to admit that I want to know more about Dani, Max, Thomas, Dani's friend Mitch and Katy and Dani's family (her mother is pretty integral to this story, her brother and father far more off-panel) and hope Moklebust will give us the follow-up to Riptide in short order.