The publishing house is not at fault, and the court should recover the book money for it. Foundation; 65438+10.2, Party B sent a letter to Party A ordering a set of China laws. At this point, the contract between the two parties has been established. The Contract Law clearly stipulates that once a contract is concluded, it will take legal effect immediately, and neither party has the right to change it or can only change it with the consent of both parties. It is invalid for Party B to cancel the order unilaterally on the 3rd, which is a breach of contract. The contract is still valid. As for not arriving on time, it should be the responsibility of the post office. Accordingly, Party B shall pay the book price in full and bear the relevant expenses arising therefrom.