Ep 1. Unwritten Rules

As Frank Reagan returns to his duties as New York City police commissioner following his suspension, he finds himself embroiled in a high-profile case involving a celebrity's son. When the young man is arrested for drug possession, a media circus ensues, and Frank has to navigate the delicate balance between protecting the justice system and protecting his officers. Meanwhile, Danny and Jamie face their own challenges on the job. Danny investigates a case involving a wealthy businessman and his missing son, while Jamie struggles with the department's unwritten rules when a fellow officer is accused of using excessive force. As tensions rise and loyalties are tested, the Reagan family must come together to protect each other and their city. Blue Bloods Season 4 episode 1, Unwritten Rules, is a thrilling start to the new season that will keep viewers on the edge of their seats.