The Fall of the West: The Death of the Roman Superpower by historian Adrian Goldsworthy. A good overall history of the collapse of the Western portion of the Roman Empire by the late 5th century AD. The Eastern portions of the Empire would continue (often referred to as the Byzantine Empire) until Constantinople was taken by the Ottoman Turks under the Sultan Mehmed the Conqueror in 1453
Decided to put down my current book and start The Saga of the Volsungs and the Saga of Ragnar Lothbrok translated by Jackson Crawford.
Jackson Crawford was recommended to me from someone else here on CF. Glad they did. Jackson Crawford is a Nordic language instructor at University of Colorado and has a good YouTube series explaining Norse mythology and sagas.