It's graduation day and the Walker family is hopeful about the future, until Cordell goes missing; the rangers have all hands on deck to bring Cordell home safely, but Stella has ideas of her own on how she can help.

While Cassie and James lead the charge to find Walker, the situation goes from bad to worse when Liam also goes missing; Stella and August pursue a lead of their own.

Cordell is stuck trying to convince everyone, including himself, that he has moved on from the hell of captivity; Stella comes clean to her dad about how she has been feeling; Bonham shares with Liam a way to work through his trauma.

Walker, Cassie and Captain James team up to put Trey through the final stages of his training; Walker and Cassie struggle to get their partnership back in sync.

A misunderstanding causes Walker and Cassie to examine where they are in life and what lies ahead; August strives to roll with the cool kids to disastrous results; Trey struggles with what being a ranger means for his relationship with his mother.

Walker makes good on his promise to Liam to finally discuss captivity; painful details from the past inform the present to help the rangers eliminate a dangerous threat; a new case forces Cassie to confront her aversion to dating.

Walker attempts to create a memorable Thanksgiving in the hope of luring Stella to return home; the family's annual Circle of Thanks turns into a circle of grievance; a member of the Walker family is rushed to the hospital.

The family rings in the new year with members of the Walker family resolving to make better choices across the board; Cordell throws himself into family matters; Cassie pulls Trey into a case tracking down an elusive tech mogul.

Cordell and Cassie intervene in a hostage situation at a server farm, but something Trey finds indicates something more sinister is at play; August tries to smooth things over with his grandparents; Cordell reunites with someone from his past.

Cordell is tipped off that Grey Flag may still have him as their prime target; Captain James discovers that Cordell and Cassie weren't truthful about some top-secret information; Trey's involvement in the prior week's case lands him in hot water.