The Walker family future looks hopeful - until Cordell vanishes. As mysterious captors try to physically and mentally break him, Captain James, Cassie and other Rangers strive to rescue Cordell, but Stella has her own ideas about helping.

Cassie and Captain James race to find Cordell, but the situation goes from bad to worse when Liam also disappears; Stella and August pursue a lead of their own.

While time pushes forward, Cordell struggles to convince everyone (including himself) that he has moved on from the hell of captivity; Stella admits to Cordell how she's been feeling; Bonham shares with Liam a way to work through trauma.

Walker, Cassie and Captain James team up for Trey's last steps of joining the elite organization's ranks, but he's not alone in being tested. Walker and Cassie haven't worked together in weeks and struggle to synchronize their partnership.

Walker and Cassie examine where they are and what lies ahead due to a mix-up on a seemingly simple assignment; August disastrously tries to roll with the cool kids; Trey questions how being a Ranger will affect his bond with his mother.

Walker honors his promise to Liam to finally talk about captivity, and painful details from the past inform the present to aid the Rangers in eliminating a dangerous threat. Cassie must confront her aversion to dating during a new case.

In a bid to lure Stella home, Cordell aims to make this the most memorable Thanksgiving ever, but tensions bubble over when the family's annual "Circle of Thanks" becomes a circle of grievance - and one Walker is rushed to the hospital.

After the dramatic Thanksgiving, the Walkers ring in the new year and vow to make better choices. While Cordell focuses on family matters, Cassie and Trey track down an elusive tech mogul, but Cassie may be in hot water with Captain James.

Cordell and Cassie intervene in a hostage situation, but Trey finds something more sinister; August attempts to reconcile; Liam steps up his responsibility within the family business; Cordell awkwardly reunites with someone from the past.

Cordell learns that he may still be Grey Flag's main target and Trey's last case lands him in trouble. Meanwhile, Liam pursues a new business venture despite Bonham's displeasure and Abeline and Bonham disagree over Cordell.

Cordell and Cassie dig deeper into his military buddies' deaths and uncover inconsistencies that he may not be ready to face; Trey is given a new opportunity; Captain James receives news from Kelly; Bonham remains at odds with his family.

When Cordell and Cassie realize that they aren't the only ones keeping secrets, Cassie is left questioning who she can trust. Meanwhile, the rest of the family focuses on the horse rescue, but they still find themselves facing challenges.

Cordell and Cassie aim to find out more about Grey Flag's plans; Liam and Stella's horse rescue is offered support from a philanthropist; Trey's new assessment is in unfamiliar territory with a partner that could compromise his aim.

Cordell must face the decisions he's made and accept how it's affected his loved ones when an old friend returns. After Grey Flag's devastation, Trey feels like an outsider, but a new case forces him and Cassie to overcome their issues.

Opening day at Liam and Stella's horse rescue is finally here. Afterwards, the boys are off for a camping trip while the ladies plan a relaxing day at the spa, but nothing ever goes as planned.

This is a big day for both the Texas Rangers and the Walker clan as friends and family gather to celebrate a very special event.