Jean-Claude Van Damme is a global martial arts and film sensation, also operating under the simple alias of "Johnson" as the world's best undercover private contractor. Retired for years, a chance encounter with a lost love brings him back to the game. This time, he'll be deadlier than ever. Probably.

Millicent, working on her thesis about children with severe allergies, is hired to babysit little Johnny, a sickly, mute child who suffers from every allergy under the sun. As she discovers Johnny’s dark family secrets, things begin to become unhinged.