Which C.S. Lewis children’s book introduces the talking mouse Reepicheep?

Prince Caspian introduces Reepicheep, the courageous talking mouse who becomes one of Narnia’s best-known characters. C.S. Lewis’s novel was published in 1951 as the second Narnia book to appear in publication order.

Reepicheep leads a group of talking mice who fight for Prince Caspian against King Miraz. He is small but intensely brave, courteous and committed to the ideal of Aslan’s country. His confidence and sense of honor make him a memorable contrast to the human children and larger Narnian creatures around him.

Reepicheep returns in The Voyage of the Dawn Treader, where his desire to reach the utter East drives the voyage’s conclusion. Prince Caspian itself follows the Pevensie siblings back into Narnia, where centuries have passed while only one earthly year has elapsed. The book’s title refers to Caspian X, the rightful heir whose resistance restores the old Narnian order.