Dearest Grace...

Dearest Grace... is a holotape found on a dead wastelander in Fallout 3. (The BaseID of this wastelander is 6555C and his RefID is 65561.)

Location
From Old Olney travel east to the Red Rocket under the highway overpass; the one with the Jack-knifed Nuka-Cola truck carrying the Quantum shipment. Take the road North past the three-way intersection. When you pass the billboard, begin looking East. The corpse is between standing and the knocked over trees.

Alternatively, head northwest from Chaste Acres Dairy Farm to the Red Rocket. Once there, take the road north and then turn and take the first turn east. Follow the road until you reach a building with a blue car. Go to the car, and from there, face west at a tree. Go to that tree, go past it and keep heading west to another tree. The Wastelander should be found dead under that tree and the other broken tree next to it.

Behind the scenes
This is a reference to Homer's Odyssey in which the main character goes on a long trek after the Trojan War.