to be a competent pilot. Training is overseen by new arrival Jill Gulbirra, an Australian dirigible pilot and strident feminist. The airship launches and rapidly makes the journey to the pole, where they discover the sea and the dark tower described by the Egyptians. Firebrass and several others abruptly board a helicopter to fly down to the tower, but it explodes, killing them. Engineer Barry Thorn is jailed after it is discovered that he planted a bomb on the helicopter. The crew discover a doorway on the roof of the tower, but all attempts to enter it are stymied by an invisible force field. Japanese Sufi Piscator is able to make it farther than anyone and disappears into the tower. After he does not return, Jill Gulbirra decides to cut their losses and return home. On the way back, they are persuaded by Clemens to mount an attack on King John's steamship. Cyrano leads the attack, which nearly succeeds in kidnapping John, but the king escapes. In the confusion, Barry Thorn escapes and parachutes from the airship, which explodes behind him. During the third plot line, it is revealed that Firebrass knew the alien from Arcturus and the death of most of humanity in the year 2003 AD. See also Riverworld American science fiction novels 1977 American novels 1977 science fiction novels Novels by Philip José Farmer Riverworld Berkley Books books