The aim is to collect sets of 4 matching cards
If you have a card, you can ask another player for cards of the same rank.
If they have those cards, they must give you all copies.
If they don't, you draw a card from the draw pile.
If the rank of the drawn card is what you asked last or the card completes a 4 of a kind, you get another turn.
Each time you hold 4 of the same card, you declare this and place them out to show as a "Book"
When either the deck runs out or someone empties their hand, the player with the most Books wins