Saphirblau
Gwen is the last member of a secret society of time travelers, and she's on a mission to find the others. With her friends Lesley and James, plus a gargoyle demon and the mysterious Gideon, she must navigate history. Gideon's fate seems tied to hers, adding a layer of urgency to their quest.
The last of the Circle of Twelve's time travelers, searching through history to find the others.
An 18th-century ghost and friend to Gwyneth who coaches her on etiquette for her trips through time.
A fellow time traveler whose fate is entwined with Gwyneth's.
Gwyneth's best friend, who researches the secret society of time travelers from the outside.
A gargoyle demon who attaches himself to Gwyneth after catching her kissing Gideon in a church.
Yes. Saphirblau (published in English as Sapphire Blue) is the second book in Kerstin Gier's Edelstein-Trilogie (the Ruby Red Trilogy), following Rubinrot (Ruby Red) and preceding Smaragdgrün (Emerald Green).