You know what I hear Danny? Nothing. No footsteps up the stairs, no jet out of the...

Danny Witwer:
This is a murder of a woman named Anne Livley.Lamar Burgess:You got this from containment?Danny Witwer:Yes. This is from the twins, Arthur and Dashiell. Agatha's datastream is missing.Danny Witwer:This is from the Cyber Parlor.Danny Witwer:Anderton dowloaded this directly from Agatha, and Rufus Riley recorded it.Lamar Burgess:It's the same prevision.Danny Witwer:Not quite.Danny Witwer:Watch the wave action across the water. Watch the ripples. MovingDanny Witwer:*away* from shore.Danny Witwer:This is from containment what Art and Dash saw.Danny Witwer:The wind has changed. The ripples are moving the other way.Danny Witwer:This murder is taking place at 2 different times. The sentry has said that Anderton was actually watching this in containment right before he was tagged.Lamar Burgess:Yes, yes. He came to me and told me about the missing prevision. He was afraid that you might find it.Danny Witwer:He was right. I *did* find it. But one question remains: Why would somebody want this erased from the data file?Lamar Burgess:Danny. Tell me. What are you thinking?Danny Witwer:I'm thinking somebody got away with murder.Lamar Burgess:I don't understand.Danny Witwer:Well, Jad told me that sometimes the Pre-Cogs see the same murder more than once.Lamar Burgess:It's called an "echo".Danny Witwer:Jad calls it "Pre-Cog Deja Vu".Lamar Burgess:Yes. The Pre-Cog Technician finds these echoes and disregard them.Danny Witwer: Yes, but um... what if the Technician only *thought* that he was looking at an echo? What if he was really looking at was a completely different murder altogether?Lamar Burgess:Uh, I don't understand.Danny Witwer:All you have to do is hire Someone to kill Anne Livley for you, Someone like a drifter, a neuroin addict, somebody with nothing to lose. Pre-Crime stops the murder from taking place, Halos the killer, takes him away but then, right then Someone else that has viewed the pre-vision. Dresses in the same clothes, commits the murder in *exactly* the same way. Technician takes a look, *thinks* he's looking at an echo, erases it.Danny Witwer:Of course, this would have to be somebody with access to the previsions in the first place. Someone *fairly* high-up...Lamar Burgess: You know what I hear Danny? Nothing. No footsteps up the stairs, no jet out of the window, no clickeyty-click of the little spiders. Do you know why I can't hear those things Danny? Because right now, the Pre-Cogs can't see a thing