Sapphire Blue. Poster of the 2014 movie and cover of the 2010 book
VS3
Sapphire Blue
Kerstin Gier, 2010
movie vs book
Felix Fuchssteiner, Katharina Schöde, 2014

Gwen has recently unearthed the truth that she is the ultimate member of the clandestine time-traveling Circle of Twelve. Now, she must navigate the challenges of frequent journeys to the past, navigate her relationships with Gideon, and unravel the mysterious and ominous secrets enveloping the Circle.


Emerald Green. Poster of the 2016 movie and cover of the 2010 book
VS3
Emerald Green
Kerstin Gier, 2010
movie vs book
Felix Fuchssteiner, Katharina Schöde, 2016

An adaptation of the concluding installment in a renowned time-travel trilogy unfolds as Gwendolyn grapples with a shattered heart and the question of whether she can trust Gideon once more. With no time for despair, a remarkable turn of events thrusts Gwendolyn into a race against time, where the stakes are higher than ever.