Blue Bloods (2010)

S11E15 The End

The Reagan family is thrown into turmoil when Danny uncovers a startling truth about their latest addition, Joe. It turns out that Joe is secretly operating as an undercover agent for the ATF, aiming to dismantle a gun-trafficking network. The revelation sends shockwaves throughout the family, forcing them to grapple with the risks and implications of Joe's dangerous mission.