This week's episode brings us to Tony's past after his former partner is found dead, seemingly killed by the P2P killer. This dredges up the past--how Gibbs meets Tony and why Tony left the department--and we largely see the same guy we do now. As for the murderer, it was just a copycat killing, but the P2P killer is involved and actually helps on the case to lead them in the right direction.
"Baltimore" isn't too dramatic, but it has lots of great moments between Gibbs and Tony, both in the present and the past. As we reach the final two episodes of the season, there will be revelations, and the promo for next week's episode suggests that someone will die and an old character will return.
Score: 8.7/10