As Ronald Knox was preparing to enter the Catholic Church, he took with him, as a spiritual-reading traveling companion, Virgil's Aeneid. The physical journey of Aeneas toward Rome provided a well-polished mirror to the spiritual voyage of Knox to that other, perfect Rome-the Eternal City of Christendom. "Ingeniously constructed on the Virgillian frame," as Evelyn Waugh writes in his Foreword, A Spiritual Aeneid is Knox's account of his conversion from the Anglican Church to the one, holy, Catholic, and apostolic Church.

As moving and memorable today as when it first appeared in 1918, A Spiritual Aeneid endures as the "essential introduction" to Monsignor Ronald Knox, a devoted servant to the One who makes all things new.