3 for $25 book 2 of 3 Ten Thousand Skies above you by Claudia Gray

YA In this stunning sequel to A Thousand Pieces of You by New York Times bestselling author Claudia Gray, Marguerite must race through various dimensions in a desperate attempt to save the boy she loves. Ever since she used the Firebird, her parents' invention, to cross through to alternate dimensions, Marguerite has caught the attention of enemies who will do anything to force her into helping them dominate the multiverse—even hurt the people she loves. She resists until her boyfriend, Paul, is attacked, and his consciousness is scattered across multiple dimensions.