On Friday, Walden Media and Disney released The Chronicles of Narnia: Prince Caspian, the sequel to the wildly successful 2005 film The Lion, The Witch, and the Wardrobe. The filmmakers faced the challenge of turning a beloved book with a slow plot into a modern film, but also one that retains the story’s spiritual messages.

“The underlying messages are so important, and so vital to the story,” says Douglas Gresham, Lewis’ stepson and co-producer of the new film.

“Which are the return to faith, truth, justice, honesty, honor, glory, personal commitment, personal responsibility. Also the message (that) no matter how far away we stray, there’s only one way back.”

In Prince Caspian, the children return to Narnia (this time through a tube station near London’s Trafalgar Square). Although they are only a year older, 1,300 years have passed in their former kingdom. The evil interloper Miraz has stolen the throne from Prince Caspian and forced the true Narnians into hiding.