While acclimating to purgatory at Split River High, Maddie becomes determined to solve the mystery of her disappearance. While observing those she left behind, Maddie begins to realize everyone is not as honest and loyal as she once thought.

When the search for Maddie's killer puts Simon in real jeopardy and exposes Maddie's connection to the living world, Maddie must navigate Split River High's spooky spectral underbelly - first alone, and then with the help of her fellow ghosts.

As Homecoming unfolds at Split River, Maddie finds herself divided between accepting her fate in purgatory and a newly hatched plan to crack a new suspect.

Amongst the sparkly lights of Split River's Homecoming Dance, Operation Find Maddie's Killer goes into overdrive leading to surprising revelations.