As the team searches for a vigilante killer in Cleveland, Rossi's former Marine sergeant goes missing in Los Angeles and J.J.'s secret catches up with her.
Hannah has a hit song with Austin Rain. On screen it looks like they get on well. In fact they can't stand each other. Hannah owns up on TV, to persuade Jackson not to cheat in an exam.
Melinda tries to persuade the mayor to cancel the memorial, and searches for missing children with Professor Payne.