Mermaid to the Rescue. Purgatory Falls Mysteries, #3

The last thing Brooke the mermaid needs right now is her mother showing up in Purgatory Falls to "help" her get organized to leave town. For one thing, she has a street fair to help with in a few days, and she's also just tripped over a headless man in an alley. She has murders to solve!But she did make her family a promise that she would leave the paranormal town and return to the human world, so while she figures out if a series of murders might be the work of one serial killer, she weighs her options carefully.
Adding to her confusion, all her friends want her to stay-except the one who matters most. Aiden, a dragon shifter she's become close to, seems strangely distant and might be planning a new life of his own. Will dealing with a serial killer in Purgatory Falls be the biggest challenge of Brooke's life? Or will it be figuring out where she really wants to call home?