Wandering Old Case Officer Part 2 is the seventh chapter of the Black Lagoon spinoff series Eda Initial Stage. It was originally released on October 19, 2022.

In a large building in daytime, Eda and Amber inform ex-CIA agent Jeremy Stainton that another ex-agent, Harold Meyer, is after him, making him wonder why he is being targeted. Clarifying that she wishes to know too, Amber says that she asked the agency for information but did not find any connection between him and Meyer. Reminding Stainton that he was assigned to work in Germany after World War II, Eda states that Meyer is an East German deserter. Not being able to remember anyone who is familiar, he mentions that he did lots of unspeakable things during his time in the CIA but cannot say anything openly. Claiming that he genuinely feels guilty, Stainton added that his work with children's charity work is essentially his way of atoning for his CIA work. Later, at a restaurant, Eda asks her partner if she believes him, but Amber sips her beverage and answers that her experience has told her to never trust any retired or active agent.

Recalling that Stainton's Philadelphia charity helps children with speech problems, Eda thinks that it may be a cover, prompting Amber to joke that she takes things too seriously. Thinking back to how Meyer visited Stainton's wife before they met him, Amber explains that the latter man's wife likely told Meyer about Stainton giving a lecture, assessing it as a good starting point. That night, in their hotel room, Eda takes a bath while Amber reapplies bandages for her right shoulder wound. Stepping out of the bathroom, Eda asks her how her wound is, declaring that she is glad Mrs. Stainton was able to come to her aid quickly. Brushing off the pain, Amber replies that it is of no concern. Showing Eda some pieces of paper, she tells her that it is Meyer and Stainton's digital records that were archived in the agency's servers, advising her to review it since she already did.

The next day, at the education program symposium, the two women wait in the back of the auditorium in an attempt to spot Meyer. While standing in the back, Amber reminds Eda that Meyer is a veteran agent who knows how to blend into a crowd. Eda clarifies to her that she did not read the case files and archives on Meyer, annoying her. She tries to calm her by guessing that Stainton recruited Meyer as an alleged ex-Nazi to recruit scientists after the war or that he was a double agent for the USSR, but Amber rebuffs her two guesses as being dead wrong. Accordingly, Amber explains that Stainton had participated in Project Bluebird (later renamed Project Artichoke and then MKUltra) brainwashing operations during his time in Frankfurt in West Germany. When she insults Eda for her poor guesses, a few guests glare at them for their loudness. Quietly whispering to her partner, Amber elaborates that MKUltra's purpose was to perform brainwashing experiments with LSD, affirming that Stainton was involved in several operations for the Bluebird project in Frankfurt, Germany. She also claims that the CIA looked for ways to successfully interrogate their enemies during the Cold War. Although the accusation that the USSR obtained methods of mind control turned out to be false, many spies and prisoners of war had already lost their lives as test subjects.

Eda again asks about the connection between Meyer and Stainton, and Amber comments that the records are not detailed because the concurrent CIA Director Richard Helms took the effort to destroy any MKUltra documents when the details were revealed. At that point, the audience begins to clap since Stainton finished his speech, and he thanks a few people for their compliments about his speech. Hurrying up to enter another area, the two agents try to keep sight of Stainton, with Amber warning Eda that they cannot let him out of their sight. As he enters the waiting room to wait for his car to be retrieved, Stainton assures his associate that the room is just fine. As the door shuts, Meyer turns around and is shocked to see Meyer, who holds a pistol and orders him to sit down. Elsewhere, frustrated that Eda let Stainton out of her sight, Amber urges his associate to tell them where Stainton is. As his arms and legs are tied to the chair, Stainton calmly asks if he is Meyer. When he asks what he has done wrong to him, Meyer tightens the restraints around his neck and in turn sternly asks him if he remembers what he did at the Juster Mansion and Camp King, shocking Stainton.

Suddenly, Eda and Amber burst into the room with their weapons drawn, prompting Meyer to point his gun at Stainton's head. He asks the women if they are Stainton's maids, but Amber, explaining that they are not on an official mission, merely pleads with him to leave Stainton alive in exchange for walking away. Retorting that he is not interested, he proclaims that he only cares about killing Stainton to avenge his dead parents and sister. Relaying his story to them, Meyer remembers that his parents did not want him and his sister to continue living in the DDR due to their worry about East Germany's future. Accordingly, he fled with his family out of the country, but they got separated along the way. Whereas Meyer was able to make it to the American embassy in West Berlin, his family and sister were taken into military custody at Camp King. He explicates that the Americans began expanding their test subjects to include refugees, exiles, and vagrants alongside spies and soldiers. Mentioning that the Nuremberg Code did not exist yet to prohibit human experimentation, he confesses that he got to see the operation's test results upon joining the CIA.

Gloomily, Meyer recalls how he was devastated to find out that his own family were subjects who were killed. Hearing Eda ask if he tried to do anything concerning the revelation, he answered that he had already started his own family, and he decided that he would not do anything about his old family since he wanted to keep his new family's happiness and he had already pledged his loyalty to the United States government. Speaking about how his family as well as his enemies had died despite his protection, he furiously expresses his disgust at Stainton being praised, deriding it as a mockery. Claiming that it is how the world unfortunately works, Meyer yells that he cannot let Stainton live due to his countless murders during Operation Bluebird. As he points the gun at the back of Stainton's head, Amber tosses a smoke grenade near him. Covering his mouth, the elderly man tries to shoot at the women, but Eda kicks his arm. Restraining him on the ground with her foot, Amber remarked that it seems selfish for Meyer to bide his time while being an active agent and waiting until later to act on his grudge, saying that Meyer was no different than Stainton insofar as making excuses for himself. Looking at her, Meyer warned Amber to watch her back or her superiors would give her the same lethal fate.

Silently, she takes heed of the advice, and the police soon arrive and arrest Meyer on criminal passing charges. When Eda is confused at the trivial charges, Amber informs her that the agency still has to keep him in custody for a while lest he go after Stainton again. Moreover, she supposes that Chesterton will send him to a proper detention center where ex-CIA agents should be treated well. Reconvening with them, Stainton thanks them for saving his life, prompting Eda to awkwardly joke that he faced a lot of danger in charity work. With a solemn expression, he told her that she has no idea how paranoid the United States felt about the Soviet Union, claiming that they did everything to protect their country with a heavy determination. Afterward, the two women guess that Stainton felt sorry, causing Eda to grumpily comment that she does not want to be an apologetic person when she turns old. Smirking, Amber reminds Eda that she guessed she would die nameless in an alleyway before she can even age at all. Looking at their car, the two women realize in dismay that they have to pay for the repairs since they were not on an official mission.