The Last Odyssey is an excellent read. From Greenland to Morocco, the action never stops. Trying to find the route to Tartarus, from Homer’s Odyssey, the Sigma Force crew go full steam into the fray, finding that sometimes truth is stranger than fiction. The Sigma Force gets tasked with finding a mysterious lost city in the Mediterranean Sea region after an ancient ship is discovered inside a glacier in Greenland containing tantalizing clues to the existence of a mythological civilization that invaded the Mediterranean area and brought about the Greek Dark Ages. Why is this important to Sigma Force? Because another group is also seeking this lost city and not for humanitarian reasons. It's up to Sigma to stop them.
