Things take a dangerous turn at the courthouse when Erin is taken hostage on Blue Bloods. "To Protect and Serve" is the third episode of the show's fourth season.
Danny must keep it quiet when a movie star is shadowing him on the job on Blue Bloods. "The City That Never Sleeps" is the second episode of the show's fourth season.
Erin and Danny argue when she must release a suspect due to lack of evidence on the season premiere of Blue Bloods. "Unwritten Rules" is the first episode of the show's fourth season.
