The Voyage of the Dawn Treader by C.S. Lewis
Series: The Chronicles of Narnia #5
The story line in this book is in some ways more light hearted as instead of coming to save the day the children come to join in on an adventure. But the adventures (which bear a similarity to Homer’s Odyssey) actually give the opportunity for an even greater number of lessons to be taught. Peter and Susan could not come along this time and in their place is cousin Eustace who learns many of the lessons first hand. This one cemented Lucy as my favorite, so I find it hard to imagine what the last two will be like without her.