Sanity has a nice little heartbreaking compilation of conversations between people and their rescue forks online from people who agreed to share it. It was Eru's favorite nonfiction book of 1440. He tells her what it's called. 

She nods. "Go on."

"So Cam spends the next eight months making people suicide triggers. And the Enemy finds a way of killing them that doesn't give them a chance to trigger 'em, so he goes back and does easier-to-trigger suicide triggers. And he discovers two things: one is a secret weakness of the Enemy, and the other is that a way of collecting chip backups has fallen into the Enemy's hands.

The way of collecting backups were called the Silmarils. Demons can make them but the ones you make are deficient, the real things are too intelligent. The Enemy having them means he could duplicate and torture anyone with a chip, even if he hadn't captured them. And if we could get them back from him, it'd mean we could resurrect everybody without the help of the Valar.

The weakness is Valinor. The magic god thingies have to magically vest their power, and they vested it in the planet, over the course of millenia. If anything were to happen to Valinor, the mind-control curse they'd laid would fail, the magic they were using to prevent summoning anywhere in the universe would fail, and the Enemy would lose all his power over his servants and his ability to do the torture-uploads. I can't prove this part except by demonstrating that it happened; summoning started working the instant the planet was destroyed, the mindcontrol curse which you can detect from chip scans vanished, and the torture all stopped and the war instantly ended and the Enemy's servants, freed, all agreed to peace terms. 

Do you see where I'm going with this? Cam destroyed Valinor, and then he stole the backups and put it back with everyone back alive on it. He's about halfway done, you can verify that too."

"How do we conduct chip scans to check for mind control?"

"The mind control affected three hundred thousand people who were on Valinor's moon Araman at the time. You can conjure for their chips just before and just after the mindcontrol curse was laid, and then run a machine learning algorithm on your data. Same for the same people just before and just after the destruction of Valinor."

"Right, but what's the equipment we'd need to read them?"

"I will have the people who did it send you their data, we've been using the Silmarils to read from and I don't think dummy ones do for that."

Nod.

"Cam also had a conversation with the Valar about the mind control curse, he was worried it'd follow him to Hell -" instructions to get the transcript.

Nod nod.

"Questions?"

She has lots!

He answers them. When she is done - "so I have a lot of information this interesting, and was having a hard time finding people in Hell to tell them. I am really eager to see if this works out or if it gets too distorted to be useful."

"The writeup should be in the next edition!"

"All right! Have a nice day."

"You too, thanks for the tip!"

"Like I said, more where it came from." And home.

Vanishment.

And off to send her the machine-learning data without anything reconstructible to a read-write machine.

"Couldn't this backfire if she happens to dig up the true story?"

"She has me on video not technically telling any lies. She could conjure the oath but without context I'm not sure that adds much of anything to the story; she can't distinguish between 'Cam has a demonic Silmaril and is doing backups wholesale' and 'Cam has a real Silmaril and is doing backups from it' and backups she tries won't work, she could conjure for everything Cam made since he landed and get some dangerous stuff that way but if learning that Valinor got put back was going to inspire someone to do it it was going to happen. I sort of expect we are going to eventually need a couple daeva checking for people made in Hell and then - I mean, if we really need to we can in fact Imperius them into taking a summons."

"By we do you mean me."

"Yep!"

"I don't want to play demon-Auror with this much to learn."

"Well, if it becomes a problem we will stop time in Hell again until you've learned all the things and are ready to do some demon-Auroring."