The new Lieutenant arrives at the precinct, and everyone soon learns that she and Hobbs have a romantic past; A cable installer confuses Toni for singer Tamela Mann.

Toni faces a moral dilemma when the administrators at her school decide to change the students' standardized test results; Hobbs' mother brings her new fiance for a visit.

The Manns' cousin Barry comes for a visit and goes undercover to help break up a crime ring, rival detectives compete with Hobbs and Mann to solve the cold case.