Kerstin Gier is a renowned German author best known for her novels targeted at adults and young adults. Among her most celebrated works is the Ruby Red trilogy, a gripping series about time travel, which has captivated a global audience. The trilogy, alongside her Silber trilogy, showcases Gier's adeptness at weaving intricate narratives that transcend time and space. Notably, the English translations of these series were masterfully done by Anthea Bell, further elevating Gier's international acclaim.

In addition to her widely popular series, Gier has a diverse portfolio of novels under her belt. She has also published under the pseudonyms Jule Brand and Sophie Bérard, showcasing her versatility as a writer. Her storytelling prowess extends beyond the realm of fiction; several of her works, including Ruby Red and The Mothers' Mafia, have been adapted into films, bringing her enchanting narratives to life on the silver screen. Beyond the accolades and adaptations, Gier's novels have found a cherished place in the hearts of readers worldwide, demonstrating the universal appeal of her imaginative tales.

Gier's journey as an author began in 1995, marking the start of a prolific career that has spanned decades. Her inspiration draws from a myriad of sources, from the complexities of motherhood to the mysteries of time travel and the allure of dreams. Gier resides near Cologne, Germany, with her family and two cats, continuing to enchant and inspire with her literary creations.