Season three of School Spirits plunges Maddie Nears and her friends into a deeper, darker mystery as the veil between worlds grows dangerously thin, delivering twists that challenge everything they thought they knew. After clawing her way back to life, Maddie struggles with terrifying visions and the weight of protecting both the living and the dead while Simon - trapped in the afterlife - becomes obsessed with the secrets buried in Split River High's scars. Why have so many people died at Split River High? What was Mr. Martin warning them about? As they search for answers, new dangers and dark secrets begin to surface.

Throughout the season, Maddie Nears is still stuck in the afterlife with the knowledge of what happened to her, and must unite her friends in the spectral and living worlds in order to reclaim her stolen life.

School Spirits focuses on Maddie Nears, a teen stuck in the afterlife who decides to investigate her mysterious disappearance alongside a group of other students who are also stuck in limbo at their high school. Maddie goes on a crime-solving journey as she adjusts to high school in the afterlife, but the closer she gets to uncovering the truth, the more secrets and lies she discovers.