Mel suddenly finds herself haunted by memories of her mysterious breakup with Ruby, while Maggie's demon-hunting habit puts strain on her relationship with Jordan. Harry tries to train the newest Charmed One, but gets derailed when they all must focus on a formidable new nemesis who starts wreaking havoc throughout the magical world.

As Mel works to regain control of her powers, a conspiracy theorist hobgoblin threatens the lives of everyone at the Blue Camellia. But when Maggie and Kaela step in to help save the present, they end up getting stuck.. in the past.