Walker, Cassie and Captain James team up to put Trey through the final stages of his training, a “Rangers hell-week” that will ensure he’s ready to join the ranks of the elite organization, but it’s not only Trey who is put to the test, Walker hasn’t worked with Cassie in weeks and both struggle to get their partnership back in sync.

Walker sets out on a new mission. August opens up to Geri and Liam. Bonham notices that something is off with Abby. Meanwhile, Luna introduces Cassie to an old friend, and things don't go as anticipated.