Lost to the West: The Forgotten Byzantine Empire that Rescued Western Civilization (2009) by Lars Brownworth is a quick history of the Byzantine Empire. Brownworth made a series of podcasts about 12 Byzantine Emperors that he turned into this book.
The book isn’t as in depth as John Julius Norwich’s Trilogy, but the advantage is the book is much shorter. It’s fairly readable.
It’s a bit odd reading books like this, you wonder how many of the facts you retain. I enjoyed the book, it’s given me some idea of the history of Byzantium.