Margaret Gabrielle Vere Long who used the pseudonyms Marjorie Bowen and Joseph Shearing, was a British author who wrote historical romances, supernatural horror stories, popular history and biography. Her total output numbers over 150 volumes with the bulk of her work under the 'Bowen' pseudonym. She also wrote under the names Joseph Shearing, George R. Preedy, John Winch, Robert Paye and Margaret Campbell. After The Viper of Milan (1906), she produced a steady stream of writings until the day of her death. Bowen's work under her own name was primarily historical novels. Bowen crafted a trilogy of historical novels about King William III. The novels are I Will Maintain (1910), Defender of the Faith (1911), and God and the King (1911). The 1909 novel Black Magic is a Gothic horror novel about a medieval witch." Bowen also wrote non-fiction history books aimed at a popular readership. Under the pseudonym "Joseph Shearing", Bowen wrote several mystery novels inspired by true-life crimes. For instance, For Her to See (1947, AKA So Evil My Love) is a fictionalised version of the Charles Bravo murder. The Shearing novels were especially popular in the United States, Moss Rose, The Golden Violet and Forget-Me-Not achieving both critical and commercial success, being championed by reviewers such as Phil Stong. Until the late 1940s, the true identity of Shearing was not known to the general public, and some speculated it was the pseudonym of F. Tennyson Jesse. Under the "George R. Preedy" pseudonym, she wrote two non-supernatural horror novels, Dr. Chaos and The Devil Snar'd. Her last, posthumous, novel was The Man with the Scales (1954); it is about a man obsessed with revenge, and contains supernatural elements reminiscent of E. T. A. Hoffmann. Many of these stories were published as Berkley Medallion Books. Several of her books were adapted as films. Bowen's supernatural short fiction was gathered in three The Last Bouquet (1933), The Bishop of Hell, (1949) (featuring an introduction by Michael Sadleir) and the posthumous Kecksies, edited for Arkham House in the late 1940s, but not actually published until 1976.