Saint Paul: The Thirteenth Apostle from the always reliable Daughters of St. Paul. This one is suitable for adolescents and young teens. Here is a description from the publisher, Pauline Books & Media:

From a persecutor of the early Christians, St. Paul was changed forever when he met Christ on the way to Damascus. Although he was not one of the original twelve apostles, he became known as the “thirteenth apostle.” He traveled great distances, preaching and writing as he went along, to bring the Gospel of Jesus to everyone. His great love for the Lord and for all people will inspire young readers to follow his example!

Includes a glossary and a concluding prayer, as well as five black and white illustrations. Also includes maps of St. Paul’s four missionary journeys.

Paperback / 128 pages / Dimensions: 4 1/2″ x 7″ / ISBN: 0819871028

St. Paul the Apostle by the late and prolific Fr. Lawrence Lovasik, S.V.D. It’s a short picture book with excellent text covering the Apostle’s missionary journeys. Ideal for young readers, e.g., K-2.

Both volumes are available via a variety of online booksellers or at your local Catholic bookstore.