The Dark Design is the third book in the epic Riverworld saga, in which almost all of humanity has been resurrected on a strange planet along the shores of a river 22 million miles long. But why have humans been given another chance at life, and who is behind it all? That's what Sir Richard Francis Burton and Sam Clemens set out to discover in two earlier novels, one by riding the "suicide express" (if you die on Riverworld, you're resurrected again at a random point along the river) and the other steaming on the greatest riverboat ever seen. Now Milton Firebrass, Clemens's former enemy and now his No. 1 lieutenant, is planning to use the dwindling iron supply on the Riverworld to create a great airship, which can fly to the North Polar Sea far more quickly than any boat can travel. There he hopes to learn the secret of the mysterious tower thought to house the beings who created this planet. Jill Gulbirra does not care as much about the mission as she wants the chance to captain the great airship, which in all likelihood will be the last airship ever constructed by humankind. But in landing the coveted role, she faces stiff competition--especially from the greatest swordsman of all time, Cyrano de Bergerac, who turns out to be a natural pilot. But even if Jill can win the command of the airship and even if the ship can reach the river's headwaters, there is no guarantee it can get through the mountain wall that surrounds the tower. And it's likely that one or