Sarah Koenig

Yasir says, I didn't make that call.

I don't know anything.

Their notes from that conversation say, quote, If Adnan wanted to get rid of the car, where would he do so?

Ali indicated somewhere in the woods, possibly in Centennial Lake or the Inner Harbor, unquote.

No one has ever gotten to the bottom of who made this anonymous call.

The cops didn't figure it out.

Anand's attorney didn't figure it out.

I've tried to figure it out, too.

For a while, I couldn't let it go.

Because it seemed to me that whoever made this call, he must be the key to the whole thing.

But so far, I only have guesses that I can't responsibly say out loud.

Anyway, the day after the Pizza Hut talk on February 16th, the detectives do some paperwork that will ultimately crack the whole case open for them.

They get a subpoena for Adnan's cell phone records.

The results of that subpoena include a list of all the calls dialed and received on Adnan's phone on January 13th, the day he disappeared.

That list will become arguably the most important piece of paper among all the thousands in this case.

It'll become their map.

And they'll follow it, call by call by call, like footprints that end up at Adnan's front door.

If you look at that call log from January 13th, there are 34 calls that day.

Obviously, the first thing they have to do is figure out who all the phone numbers belong to, home, cell, and pager numbers.

Once they do, they realize, wait a minute, one person was called six times that day, much more often than anyone else.