G. I. Williamson, The Heidelberg Catechism: A Study Guide. PR Publishing, 1993.
The Heidelberg Catechism was first published in 1563 and has been used by Christians world-wide. It is a good companion to the Westminster Confession of Faith. The Heidelberg Confession seems more personal than the Westminster. For example, Question one asks, What is your comfort in life and death? A. "That I, with body and soul, both in life and death, am not my own, but belong to my faithful Savior Jesus Christ . . ."
This study guide of the catechism is very helpful. Williamson has also published study guides for the Westminster Confession of Faith and the larger and shorter catechisms.
The Heidelberg catechism is divided into fifty-two Lord's Day readings. They are short enough to read in morning devotions in 52 consecutive days or spread out. Each chapter has two or more questions and answers and then a short two to three pages commentary on the questions. In addition, it includes study or discussion questions at the end. The commentary explains the catechism for the modern reader and apllies it to modern times.
I read through the book during morning devotions. This is my first time to read the Heidelberg catechism and I found it to be a trustworthy guide to the scriptures. The commentary by Williamson helps to explain the catechism. This book would be a good book to use in a church class, study group, or on one own.