Gaz, Mouton, and Craig question the two BND agents they have cornered in the Rio alleyway, threatening them with further violence if they don't tell them what they want to know. Gaz stabs the female agent in the leg, getting a reaction from her partner, who apparently has feelings for her. He then shows the two operatives the video he captured of Inspector Muir killing the Ukranians and the prostitutes, indicating that he is the party involved in the murders in London. Shocked by this discovery, the BND agents agree to tell what they know, provided the woman gets some attention to her wound and they take the discussion off of the street. 

Mouton busies himself with cleaning up the dead man, a local asset of the BND, disposing of his body and all traces of his shooting. While he attends to this, the others arrange to get a safehouse via Spero, the drug dealer who they just made a delivery to. The man offers them his Summer place, a three story mansion on the hill overlooking the city with a private drive, surveillance cameras, and security goons. Taking the two captive agents there, the increasingly sinister Gaz and Professor continue their questioning. 

The team learns that the BND was tipped off to their presence in Rio by none other than Inspector Muir of MI-5's Special Branch. Muir had also supplied their superiors in the German secret service with a dossier of evidence meant to prove the agents' guilt in the killing of the two BND men positioned on the parking garage opposite the London ferris wheel. According to the BND couple, the surveillance team was not watching them but rather Amelia Rausch, AKA Krystal AKA Sallie, their initial employer in the job to acquire Abigail Bering's jewelry box. Rausch was suspected to be involved in the disappearance of a German bureaucrat named Herrmann who had visited Kandy's brothel in Hamburg before vanishing off the face of the earth. At the time of his visit to the Reeperbahn, Herrmann had been involved in a routine inquiry into illegal dumping by a freighter of the Scizore International shipping line.

Gaz plants some microscopic bugs on the BND agents before he and Craig have them given black opaque hoods and taken out to sea on a fishing vessel, leaving them there to find their own way back home. Gaz listens as the tearful young agents recover from their ordeal and then discuss their plans. Based on what he hears, Gaz is confident they will not mention their presence in Rio to Muir or their superiors, apparently deciding instead to cast some suspicion on MI5 and the Inspector. 

The Professor and Gaz decide that the time has come to take out the monstrous Inspector Muir and try to destroy any conspiracy-operated blood banks they locate in the London area. They make arrangements with their English assets, checking on their progress and getting tips on possible angles of approach. Reggie Staunton, the flipped Firm thug, informs them that there's an East End laundromat where his sometime-employer "Ham" Porfrey holds court. Staunton notes that the basement of this building shares characteristics with the one in Kandy's brothel; its below ground, dark, cold and well guarded. 

Marcus Dooley, meanwhile, provides the team with some coagluant rounds for their firearms. The bullets are theorized to be able to negate or slow down the supernatural powers the vampires gain from their tainted blood. Dooley is also recruiting young researchers for further examination of the specimens McKee acquired in Hamburg. This team will be led by Dr. Blevins, a Dutch researcher with many contacts in the academic world. 

While Mouton stays in Brazil to watch for signs of the enemy and monitor police traffic, Gaz and Craig establish cover identities as brothers who happen to be violent Russian mobsters. They travel back to the UK and then meet with a man named Stoli, a rival of the Firm who deals in human trafficking. They offer to share their fictional business in exchange for assistance in taking out Porfrey and the rest of his mob. The brutal-yet-grandfatherly Stoli asks them to prove their worth by killing off a dockyard game known as "the Gulls". They have worked for the Firm in the past and are a nuisance to his trafficking operation. After some business negotiations, the would-be mobsters agree to do the deed.

After getting some basic information from Stoli, Gaz and Craig prepare an ambush targeting the Gulls during a party they're having at an abandoned London trainyard. Gaz calls up an old SAS buddy of his codenamed "Thor", and Reggie helps McKee recruit four local toughs to act as bodyguards and disposable fodder. Pretending to be friends of Ham's, they then contact the Gulls and say they'll be delivering some recently arrived human cargo in a panel van. Thor rigs the van with claymore explosives and prepares a sniping position on a rooftop overlooking the trainyard. The four thugs accompany Gaz and the Professor in the van as they drive it to the meeting. 

The Gulls are celebrating a recent score with music and expensive hot rods on the train tracks near a storage shed. While most are armed, few of them seem very alert to potential threats. The Gulls' leader, a Pakistani youth named Fuad, greets Gaz as the van arrives and prepares to unload its supposed load of illegally imported human beings. Taking cover behind a low concrete wall, the thugs and agents watch as Thor's explosive does its work, ripping Fuad and three of his young friends into shreds. With the Gulls completely caught by surprise, the team and their associates begin to systematically gun down the hapless gang members. The Professor gives Gaz some modified CS cannisters containing a sleep agent, and he uses another chemical concoction which will make anything it touches extra-flammable. Thor, Gaz, and the hired help take out close to a dozen of the gang members as they try to flee or respond to the attack. 

As their numbers fall to the superior firepower of the ambush, one of the Gulls manages to escape into the storage shed. An inhuman scream is heard from inside as he opens a cage to free something the gang calls "the Creeper". When one of the hired thugs displeases McKee by failing to bring some petrol cans to add to the confusion, the Professor coldly orders him to charge forward and enter the shed.

The unfortunate goon (nicknamed "Smiley") is rent by claws before he even has a chance to see the thing that killed him - Gaz, however, gets a good look at it - a pale, purple veined figure that has bony claw-like hands, black eyes, and a drooping maw. It was probably a teenaged girl at one point, but now its some sort of flesh-eating nightmare. The thugs are stunned into shock at the gory sight. When a shot from Thor's rifle fails to kill the ghoul, it leaps closer to Gaz, claws prepared to gut him. The ex-SAS soldier flings a knife in the nick of time, however, and the point buries itself in the monster's face, killing it instantly. Craig puts a bullet in the Gull who freed it as he tries to flee the scene on foot. 

With the Creeper slain, the agents focus on one of the few surviving Gulls, killing one of his sleep-gassed friends to demonstrate their cold blooded intent. They tell the terrified hoodie to run back to his bosses and tell them the docks now belong to the Russian mob.