The most dangerous day of the year - Valentine's Day - has the team on high alert, and Officer Nolan invites everyone over for a party now that he is single.

The rookies are really put to the test when their training officers accompany them out of uniform for Plain Clothes Day, which forces them to make all the decisions while on patrol. Meanwhile, Officer Nolan tries to prove he has been progressing faster than the other rookies to justify his desire of becoming a detective within five years.