After arriving in Peru, Indy and Mutt visit an insane asylum, where Professor Oxley was last seen. After locating Oxley's abandoned cell, Indiana and Mutt discover several drawings of skulls with elongated heads, and a map to an ancient tomb. Indiana decides to locate the tomb to see if there are any more clues to Oxley's disappearance. Before the adventurers have the chance to leave, they are attacked by a swarm of the asylum's rambling inmates. Indiana and Mutt escape through a small window in Oxley's cell, and continue their search for the missing professor.