With the threat of poison gas in the air, Deb has no choice but to alert Homeland Security; also Greene lets them know about the tip he gave Batista, who's still tied up at Doomsday_Adam's apartment. Deb sends Quinn and some other units to Beth's apartment, but not before Colin Hanks then sends Beth on a suicide mission to Miami Metro with the wormwood delivery device, armed with Batista's keycard so she can bypass security and the instructions to take Deb out above all others. However, Deb is out in the field, so Beth sits down to wait; after Quinn shows up just in time to save Batista from a fiery death, Dexter figures out that Beth is Doomsday_Adam's wife just in time to sequester Beth right as she sets off wormwood, so her rather grisly death is completely in vain other than leaving Dexter, who got a mild dose of the gas, somewhat physically vulnerable.
Once Homeland Security takes a cursory look, they conclude Doomsday_Adam and Beth weren't terrorists, so they back off, but Deb is not thrilled with the state of her department, as if she's the only one. Her mood doesn't improve when LaGuerta sells Matthews out, forcing him to bitterly retire, nor when Saint Therapist makes the suggestion that Deb's feelings for Dexter are a bit more, um, complex than she's admitted, eventually asking if she wants to be with Dexter. Deb cans Saint Therapist in response, which is always a convincing way to say no, I find; the subsequent romantic dream she has about him kind of drives that point home.
Dexter learns the final tableau will be the Lake of Fire, which will end in the death of the two Witnesses, and decides to try to lure Colin Hanks out of hiding by constructing his own tableau, with blood poured on a statue of an angel and with EJO's hand to boot, and leaving him a message directing him to the Slice Of Life. In response, Colin Hanks paints Dexter as the devil, just as hilariously as I thought, before heading off to walk into Dexter's trap. Only, as you'd guess, Dexter's physical incapacitation kicks in at the worst possible time, and when he wakes up, Colin Hanks tries to burn him up in a Lake of Fire tableau. As Colin Hanks drives the Slice Of Life off, the rowboat in which he left Dexter explodes – but unbeknownst to him, Dexter escaped just in time. And I should probably be shot for this, given how bad the season has been, but next week does actually look pretty good.
Dexter "turns up" to the Ricochet Rabbit, and after Deb "fills him in" on what's going on, Masuka (?), dressed in a hazmat suit, steps off the boat and tells them it's safe, but there are traces of two elements that combine to make poison gas, and if it were to be released in a closed environment, it could kill a lot of people. After a quick look at Holly's corpse (actually, they haven't even gotten her all the way up to the boat, so I guess they've decided for whatever reason that any inspection of her body will yield nothing), they head inside, where Deb dispatches Anderson to inform LaGuerta that they need to alert Homeland Security, and then the rest of them speculate about Doomsday_Adam's death. Dexter gives a summation of what seems to have happened, and the show is so kind as to give us a quick flashback to Dexter killing him, even though that happened right at the end of the last episode and they also INCLUDED THAT SHOT IN THE PREVIOUSLIES NOT ONE MINUTE AGO. Seriously, do people get offended by the show treating them like three-year-olds? I've seen more faith in the viewer from episodes of Scooby-Doo, Where Are You?. When Deb pulls off the mask and recognizes Doomsday_Adam, Greene pipes up that he gave Batista a lead about him the day before. Deb wonders where, then, Batista is...
...and we get a quick answer to that question, as Colin Hanks is just, I guess, re-tying Batista's wrists behind his back before diffidently telling him that in the new world order, he'll wish he'd had faith. Batista, however, affirms his belief in God, but Colin Hanks is unimpressed, saying he'd better start praying to Him, and fast. Nice try, Colin Hanks, but it's way too late to wish for this season to be any good. Colin Hanks then gives Beth a pep talk, saying how it's just so great that she's going to be the one to carry out God's will, and how she's going to get to see God's promised kingdom before he does, so you can plainly understand that he's convinced her to walk into Tuscaloosa Metro and set off the wormwood tableau. He shows her how to activate the device, which he's concealed in a backpack, and informs her that it will take only a couple seconds for the two ingredients to mix before giving her Batista's key card and instructing her on how to use it to bypass the security check-in and metal detector. He then smiles at her that it's "the beginning of the end," and I suppose she's too under his thrall to point out that he's only half right in her case.