Kerstin Gier

Kerstin Gier is a German author of novels for adults and young adults, born in 1966. Her young adult work includes the Precious Stone Trilogy, which begins with Ruby Red and follows Gwyneth Shepherd, who discovers she can travel through time and must untangle family secrets across eighteenth-century and modern London. The trilogy continues with Saphirblau and Smaragdgrün, and Gier also wrote the Silber trilogy.