In " Last Descendants" Owen & a group of other teens located the first piece of an ancient & powerful relic long considered a legend-the Trident of Eden This piece was sought by the Brotherhood of Assassins & the Templar Order but before either organization could take the piece it was stolen by an unknown third party The tenuous relationship between Owen & the teens fractured with some taking sides with the Templars & others with the Assassins " Last Descendants" book 2 picks up weeks after the events of book 1 There are still two pieces of the Trident of Eden to find & both groups are determined to not repeat their mistakes The next piece is said to have been buried with Mongol Warlord Genghis Khan whose tomb has never been found Now the teens on either side of the conflict will have to go deep into simulations in war-torn Mongolian China in a race against time to discover the next piece & ensure their safety before the others