A relentless Sandra is desperate to know her daughters fate, as Janet in Maddie's body wreaks havoc in the living world. Simon and friends search for Janet/Maddie in an unlikely place, as the ghosts decode Janet's past.

Maddie and the ghosts find a link between their scars while Simon and team go on a mission where tensions rise with the arrival of an unexpected visitor.

Maddie and the ghosts confront Mr. Martin, ultimately trapping him in the afterlife; new information leads to a chase through the school's scars, delaying Maddie's return to the living world and putting her body in jeopardy.