I don't know if it possible to find books in english for the most interesting and most dramatic part of byzantine history, the Fall of Constantinople.

The books from synchronous writers of the dramatic events, the four "historians of the Fall" (Alosis). Laonikos Chalkokondyles, "Byzantinon Alosis", the "unbiased", Georgios Sfrantzes an eyewitness with his "Chronicles", who wrote his memoirs off the Fall, (Michael); Doukas, "Historia Turkobyzantina", Athenian aristocrat and "unionist" with the West, and Michael Critobuli, "Histories writings", the "controversial" who wrote his book probably to win Sultans favour and actually named governor of Imbros island by Sultan.

I'll become later with more.
Thank you in advance.