When Detective Sgt. Eric Dorsey gets assigned to the twelfth precinct, he is less than thrilled about it because he's convinced his colleagues are corrupt. As a result, Barney has his work cut out to prove his new detective wrong. Harris and Dietrich bring in a suspect for disorderly conduct at a stop smoking clinic.

When Dietrich announces his intention to live a celibate life, Harris and Dorsey go on a call at a nearby hotel used in a prostitution ring. Dorsey then attempts to take one of the girls under his wings due to her age while Harris decides to take some stock advice from one of the other ladies.