"Our Saturdays are in danger. Sermon to drive away the planned opening of the Crystal Palace on Sunday" is a religious and moral work by the author Daniel Moore. In this book, the author expresses his strong protest against the opening of the Crystal Palace on the Lord's Day. He calls for the preservation of the sanctity of Sunday and emphasizes the importance of separating religious values from purely commercial and consumer interests. The book invites readers to think deeply about the meaning of Sunday as a day of rest, self-reflection and spiritual recharge. "Our Sabbaths are in danger" is a challenge to leave room for the religious by freeing ourselves from weekend and noisy entertainments that threaten our peace of mind.