Lasera ~ Book One of The Mer Archives by Danielle Mathieson Pederson

SPFBO6

I should've died in that pool. A merman saved me. Seventeen year old Valerie used to want the ripped lifeguards to rescue her, but her perceptions explode after a freak diving accident at the local pool when she’s rescued by a shy, intelligent merman named Wyn. A year before, a drunk driver killed her parents and the only thing that keeps her going is her training—she’s a champion diver—and she still spends every waking moment in the pool. Initially Valerie thinks she's going crazy and hallucinating. But she learns that her mind isn't making him up; it's because Wyn saved her that she can now see him and others can't. Wyn’s ability to see her clearly, touches her heart. What confuses both of them is why have Wyn's captors trapped him in a public pool surrounded by humans? Valerie finds out the captors are moving Wyn to a more secure scientific facility in just three days. How can she save him?