Of late I've been spending more time in ancient Athens than ancient Rome, reading Margaret Doody's series of detective novels with Aristotle and his friend and ex-student Stephanos as the sleuths. For my reviews of the series so far, see:
Aristotle and the Secrets of Life
Unfortunately, although Amazon.co.uk stocks the books, the US Amazon doesn't, though it has Aristotle Detective, Poetic Justice, and Mysteries in Eleusis available from other sellers.
The Amazon UK links are as follows:
Aristotle Detective
Poetic Justice
Secrets of Life
Poison in Athens
Mysteries in Eleusis