In this last book in the Mr. Pipes series, Mr. Pipes takes his American friends on a final trip to Europe, and together they discover the hymns of the early centuries. During their adventurous journey, Mr. Pipes introduces Annie and Drew to sixteen hymns from the early church. They learn about such early hymnists as Ambrose of Milan, Bernard of Clairvaux, St. Francis of Assisi, and St. Patrick.