Alexander Whyte delivers a series of lectures on the characters from John Bunyan's 'The Pilgrim's Progress' in this book, delving into the depth of sin and the power of prayer. Whyte, a Presbyterian and spiritual writer, expertly applies the lessons of the novel to contemporary listeners through the use of Scripture and real-life examples. These lectures are not merely intellectual, but affectionate, practical, and devotional in true Puritan style.