Sam Anderson

Just like on their hikes in the mountain preserve, they begin to circle each other, getting closer and closer to Warren's burning questions.

Just like on their hikes in the mountain preserve, they begin to circle each other, getting closer and closer to Warren's burning questions.

Warren says he believes Mark was only acting as CSP, essentially doing the marketing, not actually lighting the fires.

Warren says he believes Mark was only acting as CSP, essentially doing the marketing, not actually lighting the fires.

Almost like I knew I would. Almost like I knew I would, Mark says.

Almost like I knew I would. Almost like I knew I would, Mark says.

Now, Mark has a question for Warren. Who's doing the arsons then? He asks, who's doing the arsons then?

Now, Mark has a question for Warren. Who's doing the arsons then? He asks, who's doing the arsons then?

Warren is clinging to the possibility that, yes, Mark was involved in both writing on the sign and even sending those letters to the newspapers. But he wasn't the person who set the fires. If what you say is true, why would I have gotten involved?

Warren is clinging to the possibility that, yes, Mark was involved in both writing on the sign and even sending those letters to the newspapers. But he wasn't the person who set the fires. If what you say is true, why would I have gotten involved?

Warren tells Mark that his wife, Mia, also thinks the letters and the interview in the paper sound like Mark's words, too. Mark starts to sound kind of smug, almost like he's delighted by the idea that someone saw him in those words.

Warren tells Mark that his wife, Mia, also thinks the letters and the interview in the paper sound like Mark's words, too. Mark starts to sound kind of smug, almost like he's delighted by the idea that someone saw him in those words.

They keep hiking deeper and deeper into the canyon. Swirling around Warren's mind are those four questions he's yet to ask. Up on the rim of the canyon, Lieutenant Rob is waiting in his car.

They keep hiking deeper and deeper into the canyon. Swirling around Warren's mind are those four questions he's yet to ask. Up on the rim of the canyon, Lieutenant Rob is waiting in his car.

It's 2001, so technology is not advanced enough to be listening to the hike live. Undercover cops dressed as hikers occasionally get a visual of Mark and Warren. But Rob and the others have no idea whether Warren has accomplished his mission. They'll just have to wait. Hours go by. The full moon rises to the middle of the sky, then sinks towards the horizon.

It's 2001, so technology is not advanced enough to be listening to the hike live. Undercover cops dressed as hikers occasionally get a visual of Mark and Warren. But Rob and the others have no idea whether Warren has accomplished his mission. They'll just have to wait. Hours go by. The full moon rises to the middle of the sky, then sinks towards the horizon.

It's been nearly 12 hours since the hike began. Finally, as the sun begins to rise, two men emerge over the lip of the canyon.

It's been nearly 12 hours since the hike began. Finally, as the sun begins to rise, two men emerge over the lip of the canyon.

Warren and Mark begin their long drive home. Mark crashes out in the passenger seat. As he rests, Warren is weeping silently behind the wheel. A few hours later, and they're back in Phoenix. Warren drops Mark off at his house. Then he heads to a local grocery store.

Warren and Mark begin their long drive home. Mark crashes out in the passenger seat. As he rests, Warren is weeping silently behind the wheel. A few hours later, and they're back in Phoenix. Warren drops Mark off at his house. Then he heads to a local grocery store.