The enforcer's first question is whether the target is human or Gua. He's tired of killing his own kind, though he's not sure they're his kind anymore after "this planet got to them."

He's disappointed to learn that the new target is indeed an alien -- a Gua agent who has fallen in love with a human.

Joshua studies his target. The agent, whose name is Anita, lives with James Dutton, a physics professor with a theory about wormholes.

Talia explains that Anita was to monitor his progress as a teaching assistant. She's lied about his progress, though -- claiming he's on the wrong track while Dutton makes symposium presentations that suggest he's got his theory exactly right.

Once the book is buried, Eddie encrypts the quatrains, separating them line-by-line among four databases hidden around the Internet. Meanwhile Cade thinks one of the quatrains refers to the Gua's method of wormhole travel, which he recently learned about while interrogating Joshua.

Eddie is skeptical until he finds a listing for James Dutton, who lives nearby in Cape Charles, Washington.

The next morning, James admires the view from the deck of his secluded house in the woods. He's called back to bed by Anita, and their conversation reveals he knows she's an alien.

He's worried that the Gua will suspect Anita's disloyalty. Anita's confident that her reports of his "failure" have put them off the trail, but he's not convinced by her optimism.

Joshua arrives at Dutton's house, gets out his rifle, and begins looking for Anita. He's surprised to find the front door unlocked -- and astonished to find Cade on the deck.

Cade doesn't know where Dutton is, and wouldn't tell Joshua if he did. For his part, Joshua refuses to tell Cade what his mission is, though Cade correctly surmises the Acolyte is up to no good.

The human leaves, but not before getting a warning from Joshua: "The last time we met, I let you live. Don't make me regret that decision."

Joshua searches the house, noting with some chagrin that Cade has already found and taken the message-recording tape on the answering machine. He also finds a love letter from Anita to James.

The letter is somewhat touching -- in an awkward, Gua-ish way -- but it's not something Joshua wanted to find. In a fit of pique, he grabs and smashes a picture of James and Anita together.

Eddie and Cade listen to a message from Dutton to Anita on the playback of the tape from the answering machine. The sound quality suggests he's using a digital cell phone, and Eddie believes he can hack into company records and track down where the call came from.

Back at the headquarters, Joshua reports Dutton and Anita have fled. Another agent named Cole -- who did some initial surveillance on Anita and Dutton and wants his case back -- volunteers to track them down.

After he leaves, Talia tells Joshua that the Assembly General wants to launch the second wave of the invasion soon. Joshua goes to check out Anita and Dutton's usual haunts.

Dutton and Anita are loading the last of their gear onto the professor's boat, aptly named the "E=mc2". She feels she's "standing on the edge of an abyss", but she's not scared as long as James there to catch her.

Joshua and Cade are closing in, however. Joshua arrives first, marching down the dock and demanding to speak to Anita.

Anita frantically tells James to "get away", and is surprised to hear Joshua echo the sentiment. Both she and Dutton are shocked to realize that she's the target and he's free to go.

As Joshua prepares to shoot, Cade attacks from behind and knocks him down. Cade, Anita, and Dutton flee the scene, leaving a very angry Gua agent to watch them disappear into the shipyard.

Anita and Dutton join Eddie and Cade at their camp in the woods. They try to explain their love for each other, and tell Cade they're not willing to go public and blow open the alien conspiracy.

Cade is aghast, but Anita and Dutton just want a quiet place to live in peace.

Back on the boat, Joshua examines a strange device. Then he plants explosives in the boat.

Dutton explains his wormhole theory to Eddie, who hates flying and loves the idea of taking a wormhole from place to place instead. Cade tells Anita he's tried to understand her position, but he still thinks she and Dutton are being selfish.

That night, Anita sneaks out of bed. She calls home, correctly anticipating that Joshua has tapped the line and suggesting a meeting at the marina early the next morning.

They meet in the comparative safety of a crowded work shed with an active surveillance camera. Joshua can't understand Anita's position any more than Cade can, and is adamant that the Gua won't give up hunting her.

Anita walks out, daring Joshua to shoot her. He can't -- and his action is carefully noted by Cole, who is posing as a worker and secretly watching them both.

Anita returns to the woods, where Cade, Eddie and a very worried Dutton are waiting for her. She tells them she needed time alone to think, and that she has decided that -- since the Gua will pursue her as long as she's alive -- she'll turn herself in to the government.

Joshua reports in to Talia, who is sitting in a conference room with Cole. She brusquely tells Joshua to sit down and begins peppering him with questions about his meeting with Anita.

Joshua answers all the questions truthfully. Talia is shocked that he didn't kill Anita when he had the chance, but Joshua explains that the security camera and the witnesses made it impossible.

Of course, he points out, "had I known I had backup" he and Cole could have forced Anita to a secluded place and disposed of her.

Dutton has told a friend in Congress that Anita is a Cuban defector, and arranged for them both to be picked up at the marina. Cade and Eddie think this is a trap waiting to happen, but Dutton says there's equipment on the boat he needs.

Joshua finds himself looking dubiously at a martini. The agent who poured it for him has been tapping the friend's phone, and offers to help delay the congressman while Joshua and Cole meet Anita at the shipyard.

Cole joins Joshua on the way, and the two argue over who'll be the primary of the operation. Joshua wins.

Cade, Anita and Dutton are hiding on the boat. They're shocked to see Joshua walking down the dock towards them.

Anita gets out of the boat and goes to talk to Joshua. She knew he'd tap the congressman's line, and she has a plan.

Cade and Dutton see Anita and Joshua argue. He attacks her, then shoots her in the leg when she tries to run.

As the crack Gua agent shoots and misses several times, Cade drags Anita aboard the boat. It pulls out with Dutton at the helm.

Once they're safely away from the dock, Anita tells Cade, "Work together. I know you can." Then she pushes him off the boat.

Cole rushes up, drawing his pistol and preparing to fire. "They're getting away!" he shouts.

"No," Joshua says. "They're not." He gets out the detonator for the explosives he planted.

Dutton joins Anita at the stern of the boat for a moment, and then the two of them go into the cabin again. Joshua pushes the button, and the boat explodes.

Later, Joshua finds Cade, who is still at the dock. The human tries to attack him, but Joshua easily turns aside Cade's punch.

"Calm down," he tells Cade. Anita and Dutton are live and living in South America.

Joshua explains that Anita had helped Dutton make a working portal device, which was on the boat. Anticipating how Joshua would track and try to trap her, she enticed him to the marina with the phone call to the congressman and then enlisted his help in faking her death.

Cade asks, "Why did you help her?"

"She didn't deserve to die."

Joshua leaves with a final word of advice: Cade should lead with his right. "It's a strong punch," the alien comments, "but easily defended."

The advice surprises Cade. "I lost Anita and James today," he tells his journal, "but I found something that may be equally valuable -- an ally in the enemy camp."