When a friend is murdered, two freelancers join the ranks of Baltimore's Homicide Division to track down the killer. "Thinking Makes It So (1)" and "In Vino... (2)" construct a two-part episode that's an introduction to this new crime drama.
Well, I just couldn't think of a better synonym than "join." It isn't so much "join" as just aid them. Like Nathan Fillion's character on "Castle." He's not a cop, but he helps them whether they want him to or not.
