how do I do the mission the ley of the land
after lindsey falls down the entrance hall stairs and maxine tells you there's a disturbance in the magnetic field, you have to choose between "Listen to Maxine" and "Try to help Lindsey". choose the former and you'll start the lay of the land.
if you have already played through lindsey's nothing wrong with me quest, you'll have to either start a new save, or simply use the chapter select menu.