名侦探柯楠Millicent is taking a semester off from her studies to concentrate on her thesis about children with severe allergies, which makes her the perfect person to take care of little Johnny, a sickly, mute child who suffers from every allergy under the sun, from nickel to artificial fabric. His overbearing mother, Rebecca, is an accomplished author who is focused on her latest book release, while his dissatisfied father, Jacob, spends sweaty, shirtless days toiling away on a carpentry project in the backyard.