"Four people each become aware that they possess superhuman abilities of the mind, and are charged by their friend and mentor Professor Brodie with saving the world from Rifter forces. Brodie trains them to battle Rifters in the Delta State, a reference to the brain wave pattern achieved during deep sleep. The main characters, Professor Brodie, and the Rifters are able to enter and exit this state of consciousness at will. As in dreams, rules of physics or logic do not necessarily apply; yet, as in lucid dreaming, a measure of control over the situation can be achieved while in this state."
