Five Hundred Dollars; Or, Jacob Marlowe's Secret by Horatio Alger Jr. First Edition, hardcover, 228 pages, ISBN: 9781406565454. Very rare, valuable First Edition. Horatio Alger, Jr. 1832-1899 was a 19th-century American author who wrote approximately 135 novels. Many of his works have been. An excellent collectible copy of this great work of literature by Horatio Alger Jr.