With Fae society in upheaval, Bo finds herself facing further changes and challenges as former ally Hale becomes the acting Ash – trying to forge a new balance between Light and Dark by appointing a Valkyrie aligned with the Dark Fae, Tamsin, as Dyson's new detective partner. Meantime, Tamsin is a secret agent working for two separate clients: The Morrigan, who wants to build a case against Bo so that she can execute her; and as a mercenary for someone who wants to entrap Bo. Matters become complicated when Kenzi is kidnapped by a crazed Kitsune who assumes her identity and deliberately sows distrust in the relationships between Bo and those closest to her, just as Bo must prepare for and go through an evolutionary Fae rite of passage that forces her to explore her past and future. Danger escalates when a human scientist convinces a despondent Lauren to join him in conducting scientific research in his private laboratory – all the while deceptively concealing his intent to harness Fae genetics for himself with the use of her expertise. The third season culminates with Bo being engulfed by black smoke and disappearing into thin air, presumably whisked away by her mysterious and powerful biological father (who may be "The Wanderer" that recurred throughout the season's story arc).