Gier begins the final volume of the Ruby Red Trilogy where Sapphire Blue (2012) left off. Since learning that she is the Ruby and final member of the time traveling Circle of Twelve, everything has gone wrong for Gwen. Although she suspects the founder, Count Saint-German, of hatching a nefarious plot, nobody will believe her. Gwen also has doubts about her charming time-traveling partner, Gideon, and is heartsick that he may have been using her all along. Amid this intrigue and romance, Gwen discovers game-changing secrets about the Circle, learns her destiny and prepares for the final showdown.