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Mary Ann is a 21 year old college student, with a chronic cough and extreme fatigue. Her doctor tells her it's a case of pneumonia and sends her home with inhalers and antibiotics. But her symptoms worsen.

JoAnn Citrone's and her husband decide to start a family after enduring three long years of negative pregnancy tests. A man appears to suffer an embolism but the source of these life-threatening blood clots and how he survives stumps doctors.

Three infections emerge from the most every day locations. One affliction hits a teenager, which shuts his lungs down. Another attacks the nervous system of a personal trainer. And a third infection eats the blood of a holistic health worker.

Monsters hiding where you'd least expect. A child struggling to breathe. A man with something living in the last place he'd want. A woman with weight gain that confounds experts. Who are the monsters inside them?