When the sins of the past return to haunt the skies, can Claire stop the floating city's final descent before all is lost in the darkness below?

In the floating citadel of Summerland, Claire Voyhent thought her biggest challenge was keeping the city in the sky. But as she descends into the vampire metropolises below, she uncovers a threat that endangers not just her home among the clouds, but the entire Gravitium world.

Gene-spliced monstrosities, covert pacts between mortal enemies, and genetic conspiracies that entangle man and monster alike—Claire finds herself ensnared in a web of intrigue that spans the vertical landscape.

To save Summerland and the surface below, she must unite vampires, werewolves, and her own motley crew of heroes against this looming menace. But with betrayal lurking in every shadow, will her tenuous alliances withstand the coming storm?

Or will darkness consume them all?