The precarious equilibrium among the four Londons has reached its breaking point.Once brimming with the red vivacity of magic, darkness casts a shadow over the Maresh Empire, leaving a space for another London to rise.Kell-once assumed to be the last surviving Antari-begins to waver under the pressure of competing loyalties.Lila Bard, once a commonplace-but never common-thief, has survived and flourished through a series of magical trials.But now she must learn to control the magic, before it bleeds her dry.Meanwhile, the disgraced Captain Alucard Emery and the Night Spire crew are attempting a race against time to acquire the impossible, as an ancient enemy returns to claim a crown and a fallen hero is desperate to save a decaying world...