Here are some of the books I found indespensible:
1. "The Orthodox Church", by Kallistos Ware
2&3. "Facing East' and "At the Corner of East and Now" both by Frederica Mathews-Green.
4. "Beginning to Pray" by Anthony Bloom
5."The Illuminating Icon" by Anthony Ugolnik
"Mere Christianity" by C.S. Lewis (among other of his books) made the honorable mention, but only because he's not Orthodox. Nevertheless, Lewis does a great job at apologetics which large numbers of Christians - east and west - can agree on. For someone coming in from an unchurched background, you can do a whole lot worse than good ol' Clive Staples Lewis.
As for "Why Angels Fall", I would NOT recommend this to a new convert. This British author's argument (and the author is not Orthodox) is that "while Western Christianity has lost its heart, Eastern Orthodox Christianity has lost its mind."
Basically, the author of that book sees the Balkans as hopelessly wrenched apart by ethnic hatreds, and that the Orthodox Church had a large part to play in this. So, the central thesis of the book is arguable, (and could be argued against as well) this is not a book to give a person who is looking into what is good and wholesome about the Orthodox Church.
C.S. Lewis makes some brilliant logical arguments for the rationality of the Christian Faith, which I loved as a Protestant. However, now that I am Orthodox, I think that it can be dangerous to overly rely on rational apologetics in our proclamation of the Gospel. Our Faith is essentially mystical
, which is far more real than the rational.
But I have no doubt that God has used Lewis to bring many people to Christian truth. I think that The Screwtape Letters
might be a better suited work for new converts, since it deals excellently with spiritual warfare and exposes many tricks of the devil.