The Copper Key

Her father never stole anything. Vera Moon knows that. But knowing it and proving it are two very different things - and the only proof is a small, tarnished copper key that doesn't fit any door she can find. When Vera sneaks into Meridian High to clear her father's name, she doesn't find answers. She finds a 1994 yearbook hidden behind a wall, six student faces crossed out in red ink, and a single word written beneath each one.
Transferred. Except none of them ever arrived anywhere. Now Vera has five days, two unlikely allies, and one key that someone was desperate enough to frame an innocent man to get back. The closer she gets to the truth, the clearer one thing becomes: Meridian High has been hiding its secrets for thirty years. And the person running the school knows she's digging. Some doors are locked for a reason.
Vera's going to find out why.