Secret of Mary is a book by Saint Louis de Montfort on the Roman Catholic theme of devotion to the Blessed Virgin Mary. It complements de Montfort's other books the Secret of the Rosary and True Devotion to Mary. Saint Louis de Montfort's books attracted attention in the 20th century when in an address to the Montfortian Fathers, Pope John Paul II said that reading one of de Montfort's books had been a "decisive turning point" in his life.

“Masterfully written, The Secrets of Mary Bowser shines a new light onto our country’s darkest history.” —Brunonia Barry, bestselling author of The Lace Reader “Packed with drama, intrigue, love, loss, and most of all, the resilience of a remarkable heroine….What a treat!” —Kelly O'Connor McNees, author of The Lost Summer of Louisa May Alcott Based on the remarkable true story of a freed African American slave who returned to Virginia at the onset of the Civil War to spy on the Confederates, The Secrets of Mary Bowser is a masterful debut by an exciting new novelist. Author Lois Leveen combines fascinating facts and ingenious speculation to craft a historical novel that will enthrall readers of women’s fiction, historical fiction, and acclaimed works like Cane River and Cold Mountain that offer intimate looks at the twin nightmares of slavery and Civil War. A powerful and unforgettable story of a woman who risked her own freedom to bring freedom to millions of others, The Secrets of Mary Bowser celebrates the courageous achievements of a little known but truly inspirational American heroine.

A Treatise on the True Devotion on the Blessed Virgin or True Devotion to Mary is considered the greatest book on the Blessed Virgin Mary ever written and has been recommended and practiced by eight Popes. This is the original "scrupulously faithful" translation by Father Frederick William Faber. The great Marian Pope, Blessed Pope John Paul II practiced this Devotion to Mary, in his Letter to the Monfort Fathers he says: "A work destined to become a classic of Marian spirituality was published 160 years ago. St. Louis Marie Grignion de Montfort wrote the Treatise on True Devotion to the Blessed Virgin at the beginning of the 1700s, but the manuscript remained practically unknown for more than a century. When, almost by chance, it was at last discovered in 1842 and published in 1843, the work was an instant success, proving extraordinarily effective in spreading the "true devotion" to the Most Holy Virgin. "When we praise her, love her, honor her or give anything to her, it is God who is praised, God who is loved, God who is glorified, and it is to God that we give, through Mary and in Mary (Treatise on True Devotion, n. 225)." Included is a supplementary 33-Day Preparation for Total Consecration. Paintings are by Bartolome Esteban Murillo.

Louis de Montfort presents some refreshing views on the Rosary and its power in this beautiful book. It contains spiritual reflections on the Rosary, its significance, how to pray it most effectively, and many narratives of miracles that worked for those who prayed it. The book attempts to deliver the message that Rosary is the most focused and preferred devotion to Mary, the mother of Jesus. It describes the historical and spiritual significance of the Holy Rosary and examines the meaning behind the prayers, Our Father, Hail Mary, and Glory Be. In addition, Montfort did a marvelous job providing helpful tips on avoiding distraction and faithfully praying the Rosary every day. This well-structured work is a concise, straightforward, yet inspiring read for anyone who wants to find their spiritual path. It consists of short sections called Roses. Each Rose discusses a different viewpoint about the Rosary and is somewhat addressed to a diverse group of the audience like priests or ordinary people. It's a perfect read for anyone who wants to know about the Rosary, whether for religious purpose or out of curiosity. Catholics worldwide have read the book for over two centuries, and it's still an excellent spiritual resource.

All the readings and devotions recommended by St. Loius de Montfort for consecration to the Blessed Virgin follows his True Devotion method.