It’s one of the most difficult questions in medical science today: At what point is it more ethical to cease life support for patients with traumatic brain injuries? This illuminating documentary follows the U.K.’s leading brain injury specialists at Addenbooke’s Hospital as they try to answer this incredibly challenging question and more. Over the course of six months we meet the patients, families, and doctors who are griped with the uncertainty of life after horrific accidents. Research has led to amazing breakthroughs in the field, giving doctors the ability to control the devastating effects of brain injuries. But when a patient manages to communicate despite his severe condition, doctors are faced with a dilemma: Is it okay to discontinue life support for someone who seems to be conscious? Evocative, controversial, and enlightening; viewers are given extraordinary insight into the lives of those who exist at the border of life and death.