Adventure Seed 3a: The Burning Tree
It takes 10-15 minutes for an average reader to digest 2500 words. In that amount of time, you could be up and running a game session. All you need are this Adventure Seed, your game's rulebooks, and whatever monster and NPC stats your game provides. That and a few players and you're off and running.
In the Elven-Dwarven Alliance, the people take great care to maintain relations with those who are of a different race, and so when the threat comes, it's only natural that it would come from within.