Welcome to the night shift at the hospital, but be warned: you will face the test of saving lives and the dark truth of running a hospital every day. If you add these two things together, you probably won't think this is a good job to show "heroic acts". At San Antonio Memorial Hospital, people who work the midnight and early morning shifts are usually a group of "special breeds" - especially the excitable TC Callahan (Eoin Macken). He was a military doctor and went to the cruel battlefields of the Middle East. But he will soon discover a fact: the toughest battles do not take place on the battlefield, but in a real hospital, in his own home.