Answer
Olga Romanoff is the sequel to "The Angel of the Revolution," written by George Griffith and published in 1903. The story centers around the adventures of Olga, the daughter of the protagonist of the original novel, as she becomes entangled in revolutionary activities within the Russian Empire. The novel follows Olga as she bravely navigates political intrigue, personal struggles, and the pursuit of justice in a tumultuous historical period.