Injection, volume 2, paperback/warren ellis

Consulting detective Vivek Headland, originally of the group that caused the release of a haunted artificial intelligence into the world, lives and works in New York, dealing with all the strangeness that very strange city can throw at him.

But a case involving a stolen ghost and human deli meat causes him to call for help, as the details of the investigation reveal a new battleground between humanity and The Injection.