"The Ancestral Sin"- John S. Romanides

Just finished it...it took a few tries but I finally finished it

It was an excellent book, a bit advanced (which is why I took three tries to read it), and it thoroughly covers all the background before reaching the conclusion. But more on that later...

Here's one of the finale quotes from St. Cyril of Alexandria:

"Our nature, then, became diseased by sin through the disobedience of one, that is, of Adam. Thus, all were made sinners, not by being co-transgressors with Adam, something which they never were, but by being of his nature and falling under the law of sin...Human nature fell ill in Adam and subject to corruptibility through disobedience, and, therefor, the passions entered in."
-St. Cyril, Commentary on Romans