Navy Captain Wes Masters, newly posted to head the White House Medical Unit, is a physician with only one patient, but her job is twenty-four/seven. Her charge is simple—protect and preserve the well-being of the most powerful man in the world—the president of the United States. As the First Physician, Wes must travel by President Andrew Powell's side, in the hot zone, with everything she needs to save his life if he is injured or falls ill. Her job gets even harder when she has to prove she is up to the task to Secret Service Agent Evyn Daniels, a member of the elite Presidential Protection Detail, and a woman who challenges Wes on more than just the professional front. Evyn isn't happy about inserting Wes into PPD, especially when Wes gets the post Evyn believes should go to her good friend Dr. Peter Chang. The stakes get even higher for all involved when Homeland Security Deputy Director Cameron Roberts is brought in to investigate a possible security breach, and everyone, including Evyn, is a suspect.