Synopsis from Goodreads

Fans asked for it, and now they've got it! Andrea Cremer is continuing the story she began in in her internationally bestselling trilogy: Nightshade, Wolfsbane and Bloodrose. Bosque Mar haunts the dreams of both Adne and Logan, trying to escape for the Nether, where Calla, Shay and the other Guardians trapped him in the final battle in the War of All Against All... Will he turn Adne to the dark side? Will Logan reclaim his birthright? And will darkness take over our world?