This was a pleasant surprise. So, the Ferrys (last name), ferry the recently deceased to either heaven or hell. Set in Boston, in the near future, the current world is unrecognizable due to catastrophic global warning and the subsequent unrest and disease that broke out. Think of the "lawless west" including Pittsburgh.
Nice twist with betrayal (one of which is guessable, the other more of a surprise). Mythology with with twist. Cacia and Eli are a good fit.