The show is set in the distant future where a war is being waged between humans and vampires. In an attempt to protect humanity the Vatican employs agents called Executors to destroy the vampires. One such Executor is Abel Nightroad, a seemingly haples man who is infact a very rare type of vampire who feeds not on humans but on other vampires.
This show is great. The plot is exciting and intriguing with enough mysteries and unanswered questions to keep you watching through out. All of the characters are well thought out and well developed through the series. In fact my only criticism of the show is that the obviously planned second series never materialised and so the series ends with several unanswered question, but you can't have everything can you.