While setting up protective detail on Trey, Captain James is shot and left in critical condition. Walker takes on the role of interim Captain and turns to an unlikely source for help.

Cordell needs the help of someone from his past, but can they be trusted? Meanwhile, Trey shows James and August a new way to deal with some of life's frustrations.

As Cordell and Cassie dig deeper into the deaths of his military buddies, he uncovers some inconsistencies that may reveal truths he's not ready to face. Meanwhile, Trey is presented with a new opportunity, Captain James receives some news from Kelly, and Bonham is still at odds with the rest of the family.

An old friend returns with a shocking surprise for everyone, and Cordell is forced to come to terms with the decisions he’s made and how it’s affected the ones he loves most. In the aftermath of the devastation caused by Grey Flag, Trey’s left feeling like an outsider, but a new case will force he and Cassie to overcome their issues.

It's an exciting day for Liam, Stella and the horse rescue as opening day is upon them! Then the boys are off for a camping trip while the ladies plan a relaxing day at the spa...but nothing ever goes as planned.

It’s a big day for the Texas Rangers and the Walker clan as friends and family gather to celebrate a very special event.

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

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

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

Geri is upset with Walker for not opening up to her; Cassie, Trey and James conduct more interviews.

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.