NOTE: This 2011 edition is the original printing. Early purchasers realized part six of the adventure was missing from the print edition ("The Secret of the Ancients"), resulting in Mongoose withdrawing the book for the subsequent 2012 edition.
From the back of the book:
Campaign I: Secrets of the Ancients
A complete campaign of truly epic proportions, Secrets of the Ancients takes a core theme from the original Traveller, and fully updates it to reveal the powers behind the galaxy in a way you have never seen them before. Never has a Traveller book truly been loaded with such secrets.
Written by Gareth Hanrahan, Secrets of the Ancients will start the players off in a familiar setting within the Spinward Marches, but quickly escalate to take them into times, places and dimensions they barely dreamed of. This is Traveller roleplaying at its very best.