Your explicit goal (I'm subtly implying here that there may be other goals) in Cairn Hill is to acquire as much power as possible in order to secure your succession to the stewardship of the Hearthstone family when your father dies. You go about this in two ways:
At the outset of the game, you have approximately two years in which to complete your task, but things may happen which will change that length of time.
The skill involved in the game is really the skill of managing your time most effectively. You determine what to do with your time by taking up quests.
Quests range from the trivial ("make fun of Lucifer"), to those that will dramatically alter the shape of the game ("assassinate Rhea"). Your job, then, is two-fold: find out which quest is likely to be the most beneficial for the amount of time it takes, and then execute it as efficiently as possible.
Keep in mind that the quests you choose for your character will guide his development. Often, the quickest and easiest paths require theft, murder, sometimes worse. These actions affect a person: you may find that, if you are not careful, you may grow to despise the character you have moulded. If you decide your character is unconcerned with the issue of morality, so be it; just remember that those around you may not be so complacent.
The game will have much of the usual RPG fare; spells, items, monsters, etc., though there will be no dungeons, as such. Some places will be more dangerous than others, but the dungeon/town distinction is inappropriate to this game.
Combat will be rare, but intense and lethal.
If you'd like to learn more about the world in which Cairn Hill is set, see the content section. If you'd like a deeper understanding of the systems by which the game will be run, see the mechanics section.