In the shadow of the nation's capital, Kate Livingston holds a respectable position as a government statistician when she encounters a rival from her past, the insufferable Trevor McDonough. A Harvard-trained physician, Trevor never showed the tiniest flicker of interest in Kate, and she's bewildered at the way he suddenly seeks her out. Surprising even herself, Kate agrees to Trevor's entirely unexpected and risky proposal to work side-by-side with him in his quest to rid the world of tuberculosis, a contagious and deadly disease. As Kate begins to unlock the mysteries of Trevor's past, she realizes there is much more to him than she could have imagined. His hidden depths may fascinate her, but his most closely guarded secrets and a shadowy enemy lurking in the background carry a serious threat to their future. When the truth of the past comes out, threatening to destroy everything they hold dear, how will Trevor and Kate ever overcome all that stands in their way?