there are seven lost lords

He was searching for the seven lords of Narnia who had fleed from the privious king. He would be satisfied if he discovered what had happened to them. The book explains this much more clearly.

They are both great movies but i say Narnia

The Chronicles of Narnia is a series of seven children fantasy novels by C. S. Lewis

There are seven Narnia books. The current series of Narnia movies is up to three (1. The Lion, The Witch, and The Wardrobe, 2. Prince Caspian, 3. Voyage of the Dawn Treader) but there's no guarantee that all seven will be made.