Scribe Grant's plea is a holotape in Fallout 76. It is recorded by Scribe Grant McNamara.
Location
The holotape is found in Fort Defiance, by a bulletin board just off the front entryway, on the Brotherhood side of the building.
Transcript
Grant McNamara: If you're hearing this, stranger. I'm dead. The Brotherhood is dead. But I'm relieved. Relieved there is someone, anyone, alive. I honestly don't care if you're Chinese, American, or whatever. You're a human being.
I don't have much time. But the Scorched are more of a threat than you can ever imagine. You have to find a way past the security I installed. If you're former military, all you need is your government issued military ID card. If not... find a way.
I know, some... ghost... isn't probably very persuasive. But look past your own skin, and consider there's so much at stake. We did. And that's why I'm going out to die. Ad victoriam. Scribe Grant signing out.