While Harry and Macy unravel the mystery of an ancient magical artifact, Mel helps Abby track down an unseen evil force, and Maggie deals with academic sabotage.

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.