Saphirblau
Sixteen-year-old Gwen, the newest and final member of the secret time-traveling Circle of Twelve, searches through history for the other time-travelers, aided by friend Lesley, James the ghost, Xemerius the gargoyle demon, and Gideon, the Diamond, whose fate seems bound with hers.
Secret societies, Family life, Fiction, History, Time travel
Kerstin Gier, Anthea Bell, Luis Miralles de Imperial
Kerstin Gier (born 1966) is a German author of novels for adults and young adults. Her popular young adult novel *Rubinrot* (*Ruby Red*) and its two sequels - a series about time travel - as well as her Silber trilogy were translated into English by Anthea Bell.

Kerstin Gier has also published books under the pseudonyms Jule Brand or Sophie Bérard.

**Source**: [Kerstin Gier](https://en.wikipedia.org/wiki/Kerstin_Gier) on Wikipedia