The Doctrine of Grace - Student Edition by Shane Lems and published by P & R Publishing.
An outstanding introduction to key concepts of Reformed theology! Offering a teen-friendly exploration of TULIP - Total depravity, Unconditional election, Limited atonement, Irresistible grace, and Perseverance of the saints - Lems's 12-lesson study features short information-packed explanations providing historical context and biblical support; discussion questions; applications; and class resources. A useful tool for Sunday school and youth groups.