Come si gioca a Rest in Peace?

About Rest In Peace, from BoardGameGeek:

For more than a century, two families of ghosts have been fighting each other to control the greatest mansions of the land. Claim manors and castles by sending your most frightening ghosts, and put an end to this endless war by outguessing the other family. Rest In Peace is a two-player game in which you play a family of ghosts composed of 21 cards (from 1 to 6). Each round, you will be fighting for a mansion, trying to outbid your opponent. Managing your hand will be critical and knowing when to withdraw from a fight might lead you to the final victory.