Dr. David Sternn is a physician who has received deep brain stimulation for his treatment resistant depression. He is also an addict in recovery and his psychiatrist, who controls the level of stimulation he gets, is concerned that he may be abusing the process. The two are locked on a collision course that eventually spirals out of control. This novel deals with existing technology that can be helpful but also abused and confronts the sometimes fine line between therapy and performance/mood enhancement.