I'm just writing as ideas come to mind, so there are surely plenty of gaps, but here's a sketch of a mini-campaign in the north:
PCs are telling tales in the Green Dragon Inn, or having
a bear ![Very Happy :D](images/smilies/icon_e_biggrin.gif)
in the Prancing Pony, in the first lights of the morning. Then, suddenly, a cloacked man comes in and drops unconscious to the ground . "He's one of those Rangers!" says the bartender as he spits to the ground. "They're never up to no good".
A Lore roll or Shadow-Lore trait indicate that he is fighting against some curse of the undead: he seems to have crossed the Barrow-Down during the night.
As the PCs approach him, he stutters: "B-b-b-bring this message to the Weathertop, please... hurry, the Rangers must know before it's too late!" He fades out, grasping a closed letter in his hand.
The Pcs should travel to Weathertop (maybe crossing the marshes and facing the neeker-breekers), where they meet a small group of Rangers of the North (maybe just 4 or 5 of them). Their captain tell Pcs that he must travel south ASAP with some of his men, and one of the Rangers must stay in Weathertop. But the message must reach the ears of a bigger group stationed at Deadman's Dike. The Pcs are the only ones who are left to carry the letter there.
Upon arrival at the former Fornost Erain, they are informed of the duties of the Ranger's, and their true role in Eriador as wardens against the growing darkness. The letter was sent by their leader, who was now in the south (Aragorn as Thorongil), telling the Rangers to strenghten the southern borders watch, as powerful dark spirit had left Mordor was probably heading north (in fact it is the Witch-King, Unclad and Unseen to most except to Aragorn's almost elvish senses).
The Pcs are sent to Rivendell with indications of how to find it, so they can ask master Elrond for counsel about this threat. Elrond tells them that such servants from the Enemy can't be beaten by the force of normal weapons. Their only hope lies in recovering some powerful artifacts that the Elves of Eregion build an age ago, when Sauron himself brought war upon them.
Travel to Eregion to find information about the artifacts (weapons?), just to discover that they were sent to the Dwarves of Moria as a gift when asking for their help against the forces of Mordor. The Dwarves closed the doors to the Elves, but kept the gifts in their vaults.
The heroes have to enter Moria and look for the artifacts of the Elves in some hidden vault.
After that, they have to return to Rivendell to consult Elrond about the artifacts and how to use them. When finally having a weapon (maybe not literally a sword or spear) to confront the Shadow from the South, they travel to Angmar... just to discover that the Dark Spirit has left, but had enough time to organize the Orcs of Mount Gram into a hating bunch that marches to The Shire.
Who will the Pcs call for help? The widespread Rangers? The reclusive and secretive Elves of Rivendell? The Ghostbusters?