It's Walker's birthday and Geri is pulling out all the stops, but her plans are thwarted.

Walker, Cassie and Trey are charged with keeping an 80-year-old grandmother and witness safe.

Trey and Liam try to help Walker figure out his next steps with Geri; Liam confides in Walker.

Walker's lies about the Jackal case finally catch up to him; Stella makes a shocking realization.

Geri is presented with an interesting offer, and Liam jumps in to help.

Walker, Trey and Cassie prepare for what Captain James has in store for them at HQ.

Stella goes to Bonham for self-defense training; August excels in his boot camp training.

Stella continues her search for the necklace and starts putting together the pieces of the mystery.

James, Cassie and Trey appear to make some headway in their investigation.

Walker sets out on a mission; August opens up to Geri and Liam; Luna introduces Cassie to a friend.

Cassie, James, Trey and Luna start to put together the pieces of the Jackal case.

Walker tries to make up for lost time and wants to be what Geri deserves. Cassie and Trey have their final interviews for the lieutenant position. Captain James advises Cassie and Trey. Stella discusses with Liam what she may want for her future. Bonham and Abby admit to each other what they really want for the next phase of their lives. August's graduation brings everyone together to celebrate.