The Jesus of the Gospels is a reliable guide to the Gospels from one of the most reliable guides in biblical scholarship. The book strikes an effective balance for lay people interested in a supplement to their reading of the Gospels.
New Testament introductions can be an invaluable tool for the student of the Bible. They typically provide a starting point for teachers and students of the Bible to go into more depth. More detailed than notes in a study Bible, but not as specific as a commentary, introductions fill an important gap.