Dr. Sara Alderson isn't used to her patients dying for no reason. When a young boy succumbs to a mysterious illness that defies all her efforts to treat it, she refuses to accept defeat. After two months of questions, Sara has attracted the attention of powerful people who don't want their secrets uncovered, and will go to any lengths to make sure they stay hidden. Now, time is running out for Sara to unravel the mystery before anyone else falls victim to the illness. And before her career, her family, and her freedom are taken from her by enemies she doesn't even know she has.