Familiar Destiny - Arcane Magic and Familiars, #4

Sage Holland thought she knew all the secrets. She's about to learn a few more. With her witch powers cranked up to eleven and her sassy familiar Agatha by her side, Sage faces her toughest challenge yet: juggling a supernatural treasure hunt, amateur sleuthing, and a forbidden romance. The powerful Echoing Locket remains at large, its secrets and potential for a supernatural uprising puts the entire magical community at risk, and the stakes have never been higher.
As if that weren't bad enough, she's also determined to find her parent's killer. But Sage's investigation is fraught with obstacles and a web of danger and deceit. Dark forces work against her at every turn, and the strict magical laws stand between her and Brad, the man she loves. With both personal happiness and the safety of the magical world at stake, Sage must make impossible choices. Can Sage recover the locket, unmask a killer, and find a loophole for love? Or will she be left holding an empty spell book?