You will see the square tower out the window, it matches the one in Lawrence's notebook. In the kitchen, work your way to the floor above. Turn the mechanism to lift the chandelier, then jump onto the first chandelier then onto the second one you just lowered, then onto the platform. There is some kind of mechanism over there. Looks like the chandeliers are on some kind of pulley system. Climb it and then jump onto the staircase. There is a beam in the way, you have to get some leverage. You have to make your way through the Chateau and to the gardens. Drop down and shoot the lock on the window so that Sully can enter. Make your way right to an opening in the tower.
Get to the roof and jump over to the pipe across. Climb a pipe near the wall and climb the beam. Jump down and make your way along the path past the gate of the Chateau. Cross the tree bridge and past the 1927 Auburn. Climb on the ruins and carefully walk around the cliff and enter the cave. There is a Ravine on the way so you have to find a different way around.
Get out of the car at the end of the road. In the next scene, you are driving in a jungle area in Eastern France. You send Cutter and Chloe to investigate the site in Syria, and you and Sully head to France. Two sites have those symbols, one in Syria and the other in France. There are clues in form of Sabean script symbols. A city of immeasurable wealth destroyed by god for its arrogance, swallowed forever in the sands of the Rub al Khali desert. Lawrence used to be an archaeologist, and he said that if he would ever go back to Arabia it would be to search for a place he called "The Atlantis of the Sands" also known as Ubar, Iram of the Pillars, The City of Brass. The mark is John Dee's signature, one of Queen Elizabeth's closest advisors, a great mathematician and navigator, way ahead of his time.So it was John Dee who sent Drake to Arabia. He sailed straight through, and headed to Arabia. Drake didn't screw around in the east indies for six months. (If you are just interested in the puzzle solutions, scroll down towards the end of this guide) After making your getaway in the last chapter, you now find yourself at a house celebrating a job well done.