After the spectacular collapse of the First Cleveland Bank, the employees must leave their workplace immediately, and the magnificent building is locked up. It is not until twenty years later that investors show interest in the property and hire the young architect Iris to investigate the old structure. What initially seems like a boring routine job for the unmotivated Iris gradually turns into an exciting detective work: Iris begins to look into the missing keys to the vault, the people who worked at the bank, their secrets, and their fates. She realizes too late that disturbing the ghosts of the past can be dangerous...