Elemental Arcane (The Eldritch Files, #1)

Samantha Hawthorne lives a rather curious life in New Orleans running a magic and herb shop. As an Elemental Witch in the Big Easy and owner of a wolf Familiar as well as the head of a former Faerie Queen, curious is as quiet as it gets for Sam. Until children start turning into blood-thirsty Changelings and attack their parents. When one of these children shows up in front of her shop, Sam and her friends are determined to find out where they're coming from and where the exchanged children are being kept and put a stop to it. But will they succeed when they find themselves pitted against ninja ghouls, one of the oldest and darkest enemies of the mortal world, and a secret from Sam's childhood that could unravel her magic?