WIlliam Barclay was a Scottish author, radio and television presenter, Church of Scotland minister, and Professor of Divinity and Biblical Criticism at the University of Glasgow. He wrote a popular set of Bible commentaries on the New Testament that sold 1.5 million copies.
A clear and thoughtful tracing of the Lord's Supper and its developments from the Old Testament Passover Meal, the instituting of the Lord's Supper proper by Jesus in the New Testament, and then its developments and various understandings down throughout the ages of the church. This was helpful in highlighting the importance of what is to be found in the Lord's Supper - a feeding of a spiritual nature as we are reminded of, and celebrate, and thank God for the redemption found in the life, death and resurrection of Jesus, and looking forward to that great wedding feast that is to come and be enjoyed by all of His followers,together with Jesus, when He comes again.
Concise history of the Last Supper and a short overview of the main arguments on the date and character of the meal. It feels a bit dated and old, but it's still relevant-ish.