At the tense 1938 Munich Conference, former friends who now work for opposing governments become reluctant spies racing to expose a Nazi secret.

Two girls from very different social backgrounds discover, at the age of 25, that they had been switched at birth.

Emerald Green is the stunning conclusion to Kerstin Gier's Ruby Red Trilogy, picking up where Sapphire Blue left off, reaching new heights of intrigue and romance as Gwen finally uncovers the ...

Summer vacation. Mika is overjoyed to see Windstorm again. But then she discovers strange wounds on the belly of Windstorm, for which no one has an explanation. Yet this is Kaltenbach verge of ...

Gwen has just discovered, that she's the final member of the secret time-traveling Circle of Twelve. Now she has to juggle with constant trips to the past, her relationships with Gideon and ...

On her 16th birthday, Gwendolyn Shepherd finds out that instead of her cousin, she has inherited a rare gene that allows her to travel through time.