The Secret Citadel by Monica Heath is a captivating work of fiction set in a historical context. This novel, published by Penguin Publishing Group in 1975, is a must-read for fans of mystery and detective stories. The book, measuring 5 inches in length, 7 inches in width, and 1 inch in height, has 188 pages and weighs 8 ounces. It is written in English and belongs to the genre of fiction. The book title, "The Secret Citadel," is indicative of the intrigue and suspense that readers can expect from the narrative. This edition is a mass market format and was printed in the United States.