A new baby's arrival impacts a family, told from the point of view of a delightfully unreliable narrator - a wildly imaginative 7-year-old named Shawn. The most unusual Boss Baby (Nash Grier) arrives at Shawn's home in a taxi, wearing a suit and carrying a briefcase. The instant sibling rivalry must soon be put aside when Shawn discovers that Boss Baby is actually a spy on a secret mission, and only he can help thwart a dastardly plot that involves an epic battle between puppies and babies.