In Chasing Ghosts Dagger comes face-to-face with his past in the form of an intruder who first wants to hire him, then tries to kill him. What prompted this response? The answer lies in a series of numbers which triggers Dagger's memory and leads him to a remote city...one mile below the surface, technologically advanced yet abandoned. Or is it? This is the fourth in the Chase Dagger Series which combines mystery with fantasy and sci-fi.