Erin and Anthony had their hands full this week.
On Blue Bloods Season 6 Episode 21, the they had to try and find a fearful witness who ran off before testifying in a murder case.
Elsewhere on this addictive crime drama, Garrett pressured Frank into going to the police union party, but did he really go?
Also, Danny and Baez struggled to put the pieces together after a convenience-store robbery.
Use the video above to watch Blue Bloods online to get up to speed with all the latest drama for these characters.
Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.