Love and lies can corrupt even the purest heart... In the magical underworld of Victorian London, Tessa Gray finds her heart drawn more and more to Jem, while her desire for Will, despite his dark moods, continues to unsettle her. But something is changing in Will - the wall he has built around himself is crumbling. Could finding the Magister free Will from his secrets and give Tessa the answers about who she is and what she was born to do? As their dangerous search for the truth leads the three friends into peril, Tessa's heart is ever more torn, especially when one of their own betrays them...