Helen has an aneurysm in her brain that could burst at any time and lead to her death within minutes. For doctor Sanjeev Nayak there are no second chances as he embarks on an extraordinary operation to save his patient. Michael's life is also on a knife edge. After collapsing with a cardiac arrest, he was saved by a neighbour giving him CPR. But now the trauma doctors face a double battle - they must quickly assess his head injury and also remove a clot in his artery that is destroying his heart