Four people all become aware that they each possess a superhuman ability of the mind and that they’ve been charged with saving the world from Rifter forces according to their friend and mentor Professor Brodie. Brodie trains them to battle Rifters in the Delta State, a reference to the brain wave pattern when deep sleep is achieved. The main characters, Professor Brodie and Rifters are able to enter and exit this state of consciousness at will, where, like dreams, not every rule of physics nor logic apply, yet some control over the situation can be achieved, much like lucid dreaming in this type of state.