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

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.