In “The Journal of John Ikos,” a special extra-length 30 Days of Night tale, Steve Niles welcomes artist Nat Jones (Spawn: The Dark Ages) to the world of vampires. When we last saw John Ikos, he was standing ever vigilant in Barrow. But his obsession with tracking down the vampiric Agent Norris sees his paths cross with Billy, on the run since last issue, as well as Dark Days’s Dane.