The book describes the author's theory that there was a lost civilization called Mu, which he believed existed in the Pacific Ocean and was destroyed in a cataclysmic event about 12,000 years ago.According to Churchward, the people of Mu had a highly advanced civilization with a deep spiritual understanding, and they created a series of symbols to represent their beliefs and knowledge. These symbols, he argued, were later passed down to other civilizations, including the ancient Egyptians and Mayans, and can still be found in various forms around the world.The book includes detailed descriptions and illustrations of these symbols, which Churchward claimed to have deciphered through his own research and mystical experiences. He argued that by understanding these symbols, people could unlock the secrets of the lost civilization of Mu and gain access to hidden knowledge and spiritual wisdom.While Churchward's theories have been widely criticized and dismissed by mainstream scholars, his work remains popular among some alternative historians, occultists, and new age practitioners. "The Sacred Symbols of Mu" is considered a classic of its genre and continues to inspire fascination and debate among those interested in ancient mysteries and alternative histories.