Heart of Tartarus

Everything is a game of survival in the city of criminals ... even love.
The world has become a harsh place and in the floating sky city of Tartarus, friendship is a rare commodity. When the only friend she has disappears, Cassandra will stop at nothing to find her. Even if it means risking her life.
Five dangerous men each with their own personal scars track her down, mistaking Cassandra for her missing friend. Together, they discover that Tartarus might be harboring a secret so foul that it could destroy the broken sky scrapers that house the remainder of humankind.
In the end, Cassandra will have to make a choice. Life or Death. Love or Loss. There's always a price to pay.