After magic floods into the world, bringing with it unimaginable power, ex-rock star Tucker Ambrus and firefighter Andrew Byrne's city is nearly destroyed by a devastating storm of fire. Now, as the unlikely leaders of a desperate band of survivors, Tucker and Byrne struggle to unite and protect what's left of a panicked, lawless public-both from themselves, and from new supernatural terrors like the mysterious eruptions of churning gray that devour everything in their path. But when influential leaders begin disappearing and chaos splits the survivors into warring factions, Tucker and Byrne must race to uncover a secret that links a crazed murderer to the deadly surges of magic and halt them both before it's too late … though if they succeed, they risk igniting another firestorm and tearing their homes, and their friendship, apart.