Emma and her friend Chloe are vacationing at the seashore. Right after literally running into the handsome Galen, Emma's friend is killed by a shark. Galen and Emma tried to save her, and it turns out that Emma can talk to the shark, although it's too late to save Chloe. Galen has come searching for Emma at the behest of Dr. Milligan, a human whom Galen saved and who saw Emma at the Gulfarium he runs. Suspecting that she is also a Syrena (basically a mermaid), Dr. Milligan has Galen hunt her down. Galen's sister Rayna and his human assistant Rachel (who is pretending to be his mother) take up residence in Emma's community, get to know her, and try to figure out whether she is or isn't "of Poseidon".
Our language arts teacher and a fellow blogger, told his students about the book Ripple, and they all wanted to read it, so mermaids hold some fascination. This is an interesting take on the legend, told from both Galen's and Emma's perspective, and a good alternative to other paranormal romances.