What are your most unforgettable moments in the books? For me, the single most unforgettable moment in the entire series was the following line in book 22:
I saw it drop from out of nowhere. Out of the sky. Out of the clouds it dropped. Wings back, talons raked forward. It hit David in the back of his head! Eagle feathers flew. David screamed in pain. And Tobias - yes, Tobias - said in private thought-speak, <Rachel, David is really getting to be a pain in the butt.>
Because of everything that happened before, with Tobias thought to be dead, and everyone else down and out, that was one of the very few times in the books I remember literally going "YES!!" outloud, because it was just an awesome moment.
Another most memorable moment I recall of course is Tobias initially being trapped, as well as at the end of book 13 when he greets Rachel in his newfound human morph.
Come to think of it, an awful lot of the series most memorable moments involve Tobias.