A doctor, a gangster, a policeman, and a night of fright and apprehension. Dr. Tong Qian is a mainland immigrant who worked very hard to become a brain surgeon. A haughty top performer, she has recently made a mistake and was publicly chastised by a patient. She pushes herself harder and is under a great amount of stress. Shun is a gangster who miraculously survives a gunshot wound to the head. He refuses treatment to retrieve the bullet, buying time to plot his escape. Chief Inspector Ken orders his subordinate to intimidate Shun with a gun, but it misfires. If Shun had died, it would have left no trace. His survival drives Ken to become increasingly unscrupulous in order to cover his tracks. Unwilling to let another patient die, Tong Qian is determined to operate on Shun. With his health already deteriorating, Shun must take advantage of the doctor to delay the police so he can make an escape. Ken turns Shun’s trick against him and initiates a crossfire in the hospital in order to do away with him. Meanwhile, Shun’s accomplices place explosives in the hospital, taking all innocent patients as hostage. Consumed by their own agenda, the three goes to extreme lengths, resulting in secrets, deception, and manipulation. The hospital is turned into a battlefield, with danger looming at every corner.