Atlantis has fallen, and Islington is to be punished. His fate is in the hands of two of his siblings- his powerful superior Anayl, and the young, solemn Castiel.

The Angel Islington has been waiting to be allowed back into Heaven for a long time. Will his brother Castiel help him find the forgiveness he craves?

Dean's perfectly ordinary Saturday is dramatically interrupted and he's thrown into a situation that could change his reality forever, thanks to Crowley, who owes the Marquis DeCarabas a favor. Only the denizens of London Below can help him return home.