The action begins on a huge space station, hanging at the Lagrange point between the Earth and the Moon. Dr. Spencer Reston conducts sleep research at the Deep Space Flight Project. However, during his research, strange events begin to happen to him. To understand what is happening, Reston first has to visit Mars, where he almost dies, but then the secret of the Martian civilization is revealed to him, and then India, where he has to fight the Dream Thief. Meanwhile, the space station is captured, and the hero takes an active part in its liberation, solving the main mystery - who influences people's dreams and for what purpose.