Emerald Green

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Born in the German town of Bergisch Gladbach, Gier didn’t always dream of being a writer. She studied education and psychology before finding her voice in fiction, first writing adult comedies under various pen names. But it was her pivot to young adult fantasy that brought her international acclaim. Ruby Red (Rubinrot), originally written in German, became a bestseller not only in her home country but also found devoted fans in English-speaking countries and beyond—thanks in part to its clever blend of historical intrigue and relatable teenage confusion.

Unlike many fantasy authors who focus on high-stakes wars or mythical beasts, Gier’s magic often lives in quieter moments: an unexpected connection between characters, a centuries-old secret hidden in plain sight, or the dizzying logic of falling in love across timelines. Her prose is accessible yet layered, often laced with wit that makes even complex concepts feel delightfully simple.

She once joked in an interview, “I would love to time travel—just not to a time without chocolate.” It’s that kind of charm—unpretentious, warm, and a bit mischievous—that defines her voice and draws readers back to her stories again and again.

With other series like The Silver Trilogy (Silber) continuing her exploration of dreams and parallel realities, Kerstin Gier has become a quiet force in YA fantasy. Her work speaks to the kind of wonder that doesn't fade with age—the belief that love and mystery are timeless, even if the clocks keep ticking.