What is the main goal of the Mysterious Benedict Society?

The main goal of the Mysterious Benedict Society is to stop Mr. Curtain and his mind control plans. Throughout the story, the society, which is made up of highly intelligent and resourceful children, is formed specifically to combat the threat posed by Mr. Curtain, who intends to use mind control to manipulate the population for his sinister purposes. The society's mission involves uncovering Mr. Curtain's schemes and ultimately thwarting his efforts to gain power over others. This objective drives the plot and the actions of the characters, as they work together to gather information, utilize their unique skills, and confront the dangerous reality of mind control in their world.