It’s Walker’s birthday and Geri is pulling out all the stops, but her plans are thwarted. Walker, Captain James and Trey tackle a case together and Cassie surprises everyone with her return. Abby asks for Liam’s help to bring Stella out of her cocoon. Meanwhile, August is enjoying his senior year of high school, leaving Walker feeling like an empty nester.

When Maybelline, an 80-year-old grandmother and witness, is in crucial need of protective custody, Walker, Cassie and Trey are charged with keeping the acerbic matriarch safe, and though Walker and crew call the plays, the wise elder is the one keeping score. Cassie grapples with a big decision and asks Geri for help to make some changes. Meanwhile, Stella wants to move on but continues to struggle with her grief and Liam tries to help. Lastly, August wants to join an after-school program and asks Bonham to help convince Walker to sign off on the program.

Trey and Liam try to help Walker figure out his next steps with Geri. Liam confides in Walker that he's worried about Stella. Meanwhile, Stella and Sadie look into recent events. August begins his bootcamp training and it is not what he expected. Liam helps Cassie sift through the clutter. Lastly, the family works together on a fundraiser.

Walker’s lies about the Jackal case finally catch up to him, testing his friendship with his old partner, Captain James. Cassie works a lead in the Jackal case alongside Detective Luna and learns a hard lesson. Stella makes a shocking realization.

Walker, Trey, Cassie and Detective Luna are all hands on deck with their case. Geri is presented with an interesting offer, and Liam jumps in to help. Meanwhile, Stella and August help Abby and Bonham and stumble upon some interesting information. Lastly, James tries to make amends

Walker, Trey and Cassie prepare for what Captain James has in store for them at HQ. Meanwhile, Stella and August start to put some pieces together. Lastly, Walker makes plans for his future and Liam questions his brother's motives.

Walker, Trey, Cassie and Detective Luna explore more leads as Walker starts to become more and more invested. Captain James notices Casey and Luna growing closer. Stella goes to Bonham for self-defense training and August excels in his boot camp training. Lastly, Bonham and Abby discuss the future with mixed opinions.

Liam express his concerns about Walker to Trey. Walker becomes more invested in the case as Captain James asks him to take a break. Stella continues her search for the necklace and starts putting together the pieces of the mystery. August goes to his dad for help with a school project. Meanwhile, Cassie and Detective Luna take their relationship to the next level.

James, Cassie and Trey appear to make some headway in their investigation. Stella and August make a startling discovery. Bonham and Abby have differing views about their retirement plans, with Liam serving as a referee.