Enola Holmes is based on the YA book series The Enola Holmes Mysteries by Nancy Springer. It tells the story of Enola Holmes, the younger sister of Sherlock and Mycroft Holmes, the former of whom is already famous by the time our story starts in 1884. After her father dies and her brothers leave home, Enola is left with her beloved but eccentric mother, Eudoria, at the family’s country estate. Then, on the morning of Enola’s sixteenth birthday, Eudoria disappears. Enola must follow her trail of clues and set out on an adventure to find her. The plot thickens when she meets Viscount Tewksbury, a runaway Marquess pursued by a mysterious assassin in a bowler hat. The game is afoot.