Lake of Spirits - Island of Fog, #4

Shapeshifters. Mermaids. And a shapeshifting mermaid! Sixteen years ago... Jolie was just a one-year-old baby when, as part of an experimental shapeshifter program, she transformed into a mermaid-like creature... and stuck in that form. Faced with the impossible challenge of raising her, the scientists had no choice but to hand her over to others of her kind, the mysterious miengu people of the lake. Present day... It's rumored that these enchanting water spirits can heal the sick.
Imagine if Jolie, now a teenager, can be brought back into the human world! She has the power to save lives - if she's willing. That's the task facing Hal and his shapeshifter friends. Jolie is beautiful, and the boys are utterly besotted. But the girls are certain there's more to her than meets the eye. Is she delightful... or deadly? "Robinson has crafted one of his best characters yet - a nuanced and challenging individual who will keep Hal and company as well as readers guessing until the very end." -ROGER ESCHBACHER, AUTHOR