Craig and Gaz arrive in Rio de Janeiro and lay low for several days at a local hotel. One night, Gaz receives a vivid and upsetting nightmare in which his (as yet unnamed) significant other is alone on a misty island. He goes to her as a bloody rain begins to fall from the heavens, and when she recoils from his touch, he tries to catch her. After she falls into a puddle and lies motionless, he turns her over and sees that her face is Amelia's - then wakes up. 

As he regains his senses he gets a knock at his hotel room door - its Craig with news about the blood and tissue samples gathered in Hamburg. His wealthy associate had some researchers look at them and found that they possess a number of strange properties. One of these is the mutability of the red blood cells, apparently controlled by the subject's neural pathways, suggesting that some of the vampiric powers are tied to brain functions. Craig and Gaz agree to have the rich friend continue funding more research so they can find better means to deal with the monsters in the future. 

Realizing that they need more money to get equipment, weapons, and cover travel expenses, the two agents contact an old contact of Gaz's known as "Mouton Noir", a smuggler who frequents the Carribean. Mouton offers to bring them in on a job to deliver a large amount of marijuana up the Brazilian coastline to the city of Sandoval. He could use some extra security and help dealing with the often corrupt local coast guard. The two agents agree and prepare for the trip. 

During some downtime before the night's drug delivery, Gaz is contacted by a panicked Brian (his London hacker contact) who tells him he has started to be followed. Suspecting that the vampires are onto him, Gaz advises the tech specialist to leave the city and carefully cover his tracks. Craig further suggests that he find his way to the relative safety of the manor home of Marcus Dooley, his billionaire pal. 

That night the three men finish their preparation and begin the trip north on Mouton's cargo ship. Around 3 in the morning, they are alerted to the approach of two zodiac boats bearing three men each. The masked men are wearing dark apparel and carrying an assortment of firearms, making their intentions fairly clear. Mouton fires from the deck and shatters one of the two smaller vessel's outboard engines, causing it to spray the men aboard with shrapnel. Two of them are killed instantly, and the third is later shot by the smuggler when he tries to swim back to shore. The other boat gets as far as linking up to their craft, but Gaz and Craig help the smuggler shoot the would-be boarders. One of the three shots is instantly lethal, but the other two wounded hijackers are captured alive.

Questioning the bloodied men below decks, Craig learns that they were Brazilian gun thugs hired by a local business rival of Mouton named Torres. He sedates them and Gaz informs Mouton of the identity of their patron. Dismissing Torres as a relatively minor threat, the smuggler presses on to Sandoval's waters in the early dawn. As they pull into port, they are approached by a coast guard vessel which demands that they prepare to be boarded.

The two corrupt officers get onto the ship while Craig and Mouton try to hide their illicit cargo, including the two sedated gunmen. Playing the part of a happy tourist, Craig is able to ply the officers with a bottle of liquor and distract them from their work. This last obstacle taken care of without difficulty, the three men finally get to their destination and are met by a local drug boss and his security force. The unloading of the ship goes off without a hitch, and the drug dealer (named "Spero") pays Mouton the agreed upon fee in cash.

Craig and Mouton celebrate their success with a sampling of the herb they were transporting, and the Professor informs Mouton about his and Gaz's recent encounter with actual vampires. He is surprised by the revelation that Mouton had a past encounter with a similar if not identical creature, one which killed his crew before he finally destroyed it. The man agrees to help the agents once they return to Rio. 

After an uneventful return trip, the team starts spending their money and making plans for how to deal with the supernatural enemy they all now share. While the Professor and ex-Legionnaire plot out possible strategems, Gaz spends some time in the city streets. On his trip back to the hotel where they are staying, he notes that he is being tailed by three strangers. He proceeds to set up several traffic accidents by using a scripted program which scrambles local signals, then runs. He also calls Craig, but the medical man isn't entirely coherent and doesn't fully comprehend his message.

After starting a chase that leads down a sidestreet and then into a local marketplace, Gaz backtracks toward the hotel. Craig comes out of a marijuana stupor and realizes that Gaz is actually in real danger, also alerting the similarly stoned Mouton to the situation. Once Gaz has successfully shaken the three pursuers, he decides to turn the tables and follow them instead. Craig and Mouton corner them first, however, leading to a confrontation in a dead end alley. Pointing their guns at the cornered trio, they have the drop on their would-be shadows. 

Mouton fires an unprovoked shot with his handgun into one of the three who was using a moped, killing him instantly. He asks the survivors who they are working for, and one recites a badge number while showing his ID. Gaz picks it up and discovers that it identifies the man as an agent of the German BND. This means they've just shot and killed an operative of an allied country in cold blood...