Sam prepares to enter the Tower of Cirith Ungol to rescue Frodo. As he approaches, he sees red lights in the tower's windows and senses evil is at work. At the tower gate, Sam feels a shock upon seeing the Two Watchers, immense stone figures that stand guard but are aware of intruders. They let out a cry that echoes through the walls as a warning bell rings above, signaling that Sam has been detected as he "rang the front door bell".