Jack Wallace

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.

Ruth finds a way to relax without George. Meanwhile, David and Keith consider adopting a child named Anthony, and Nate and Brenda consider giving Maya a coherent narrative.

After Dave Mendoza is injured in a drive-by, Ben takes is upon himself to solve the case -- much to Sammy's dismay.

The discovery of a small body buried in a wall prompts Sipowicz and Sorensen to reopen an unsolved missing-person case.