Sunset of the Gods by Steve White
Sunset of the Gods (2012) is the second novel in Steve White’s JASON THANOU (TEMPORAL REGULATORY AUTHORITY) series about time travelers who go back in time to study historical events. It would be helpful, but not necessary, to read the previous book, Blood of the Heroes, first.
This time Jason will accompany a couple of academics to witness the Battle of Marathon. There are a few historical debates about events that occurred while the Greeks were driving the Persians out of their country in 490 BC and the team hopes to settle these disputes.