Tate is a top-notch bad guy - meaning, he's smart, manipulative, brutal, and supremely unpredictable. Most of the episode is devoted to the harrowing ordeal he draws Alma into. Why she would go off with the kids with someone she doesn't know that well - even though she's romantically attracted to him - still seems like a bit of a stretch, but it was necessary to set up what follows: she's left in a shack in the middle of the dessert, with the girls playing with a hamster, and her hand on a grenade that will blow everything up if she moves her finger. It's just a matter of time until she tires and her finger moves, and she's so overwhelmed that she can't even immediately bring herself to tell the kids to get out of the house.
Fortunately, Gus has unknowingly been texting with Tate, and good police work by Sonya, Hank, and Marco (with an at first inexplicable assist from Tate) get the good guys to the house in the dessert just in time to save Alma and the girls. What the episode is really about is the emotional re-uniting of Marco and his family. Working with Gus to find Alma creates a new bond between Marco and his son, and Alma, grateful to say the least that Marco has saved her and the girls finally hugs him.
But Tate is still at large, and the way that Hank and Marco were able to locate the house in the dessert provides us with a clue about what is to come. After Tate eludes Hank and Marco in their attempt to nab him near a cafe, Tate delivers the GPS coordinates to the house in the dessert to Marco.
Why? I at first thought that Tate wanted Marco to see his wife and children die. And maybe that was one of his reasons. But it turns out Tate had another reason: he wanted to get Marco out of town so he could kidnap Gus. Tate clearly wants Marco's psychological destruction to be comprehensive. And if Tate's attempt to kill Alma only backfired, and drew Marco and Alma back together, Tate now has another shot at what he wants, with Gus under his control. The episode ends not with victory for Marco but this agonizing trade-off.
Meanwhile, the show had some memorable lines - in particular, Sonya's reaction to Gus referring to her as a "MILF," and just about everything that Linder said to Bob. Speaking of which, is it only me, or does Linder sound eerily similar to Hank?
See also The Bridge Opens Brooding and Valent ... The Bridge 1.2: A Tale of Two Beds ... The Bridge 1.6: Revelations ... The Bridge 1.7: A Killer and a Reluctant Professor ... The Bridge 1.8: Some Dark Poetic Justice