An eerie tale set in a remote castle inhabited by engineers who are working on a secret military project. The engineers are haunted by the ghost of a former employee who died under mysterious circumstances, causing them to question the true nature of their work and the consequences it may bring. The ghost serves as a symbol of guilt and the haunting truth of their actions, leading the engineers to face the reality of their project and the impact it may have on society. The story explores themes of guilt, responsibility, and the consequences of one's actions.