The Hunchback Assignments book 3
While once again the romance is mildly annoying, I really enjoyed this one.
The twists in the character development especially-- excellent.
And really, I'm a sucker for anything archaeology, so the Indiana Jones-esque feel is always a plus.
Definitely read the first two first, but don't stop there.
Hoping for a fourth installment... (and maybe even Mr. Socrates will stop being a dork).