IRISHMAN in N.Y. Part 4 is the thirty-eighth chapter of the Black Lagoon spinoff series Eda Initial Stage. It was originally released on June 19, 2025.

Having heard the gunshot outside the hideout, Dent runs out to find Eda and comes across her giving first aid to the wounded Latimer. She informs him that Kilner shot the police officer, making Dent angrily realize that he was the mole in their operation. In a brief flashback, before Kilner could shoot Eda as she charged him, Latimer fired one shot, hitting Kilner in his right elbow. With Latimer being in shock after firing the shot, Kilner immediately fired back and hit him in his right shoulder, knocking the officer onto his back. At the same time, Eda slammed the pistol from his hand, and in turn he pushed her head away with his arm, using the time to run away rather than fight further. Back in the present, Dent radios to other law enforcement officers to urge them to prevent Kilner's escape at all costs. Furiously recalling that Kilner has been deceiving them for two whole years, the ATF agent also calls for an ambulance. He assures Latimer that the ambulance will come soon and commends Eda for her work, saying that things would not have escalated so quickly without her cooperation. The confused Eda becomes embarrassed when Dent jokes that not many men would consider hiding a tracking device where she did. As he teases her again, Latimer asks where she hid it, but the flustered Eda tells him to shut up. Hearing her retort that men have the same orifice, the officer realizes that she hid the device in her rectum.

Very soon, the ambulance arrives and the EMTs place Latimer on a gurney. Before he is put into the vehicle, the officer apologizes and admits that he discovered Kilner was the mole but was too afraid to report it given his position of authority. Brushing it off because they cannot change what has happened, Dent merely advises him to do better next time. Eda addresses Latimer and genuinely thanks him for his help despite his initial inaction. Smiling, the rookie officer suddenly sees a vision of himself in the distance, shocking him. He then falls unconscious and is taken away for medical treatment while Eda reminds Dent that they still have a perpetrator to catch. Later, at an airport, a young man frantically runs through a terminal carrying some binders. He rushes into the men's bathroom and calls for Kilner, only to find a single man who is confused but leaves. The young man sighs with relief upon being alone, but Kilner emerges from one of the stalls and chastises him for being careless enough to utter names so easily. However, the accomplice emphasizes that the higher-ups know everything now and that the FBI will be shocked. Shouting back, Kilner replies he should be the one shocked and criticizes him for sending them weapons that would put an immediate target on them.

The young man reminds him that he was the one who insisted they needed the Stinger missile, claiming that he worked with great difficulty to acquire the weapon. Frustrated, the FBI agent grabs him by the collar and calls him pathetic, but he quickly calms down and states that their future actions are more important for now. Sweating profusely, the unnamed accomplice confesses he plans on hiding overseas for a while, reasoning that he has no choice since staying in the U.S. would be certain ruin. Kilner asks to where he is going, prompting the young man to answer somewhere in South or Central America, such as Panama or Nicaragua. The FBI agent asserts that he will come too, surprising the young man, who asks if he is bringing his family along. Solemnly declaring he will leave his family behind, Kilner explains that he will lose everything anyway if he gets caught in the United States. The accomplice accepts his request and tells him to wait nearby so that he can buy him a ticket. Kilner claims that it is not wise to go off alone, but the young man is confident he will be fine.

To their surprise, Eda appears with several law enforcement officers as she smirkingly informs them the airport is completely surrounded, proclaiming their scheme to be over and sarcastically recommending that the CIA can be trusted. Glaring at the fugitive, Dent professes he thought he could have actually trusted him despite their different affiliations. Grimacing, Kilner responds that he must be bad at seeing through people and immediately shoots him in the chest, causing panic among the airport travelers. Seeing the accomplice run away into the crowd, Eda chases after him as Dent, unharmed thanks to his bulletproof vest, runs after Kilner and tackles him. Before the FBI agent can aim his pistol, Dent disarms him and punches him despite being elbowed in the face. With the fugitive defeated, Dent rolls over as law enforcement officers come to his aid and detain the criminal.

The ATF agent rides with the arrested Kilner in the back of a police car, asking how he could shoot a colleague he knew for two years. The detainee merely states that he would be dead if he really meant to hit him, irking Dent due to the implication he should be grateful. Curious, Dent asks if money was indeed his motivation. When Kilner asks him something he already knows, he rhetorically asks if he is still resentful for loaners taking his father's farm to pay off his debts. The detainee adds that the land has been in his family's possession since his great grandfather's generation, asserting they worked hard to build it up. Though Dent assesses that money was still his incentive by profiting off the farm, Kilner denies that money mattered to him, specifying that he cannot stand his memories being destroyed for something so trivial. Muttering about it being revenge, Dent only remarks that the rest is history.

Back at the airport hangar, Kilner's accomplice comes across two pilots about to embark a plane, and they sternly tell him that only authorized personnel are allowed in the area. The criminal pulls a gun on them and orders them to step away and toss the aircraft keys to him. Frantically embarking the aircraft, the accomplice checks the plane's system display and is relieved that there is plenty of fuel, remarking he merely needs to fly away from the airport as far as possible. However, Eda quickly jumps aboard and sneaks upon him, warning him that he will not be going anywhere. She comments that it is anticlimactic a "small fry" like him is the brains of the operation. In spite of the gun pointed at his head, he slams on the gas pedal and uses the forward force to push Eda against the passenger seat. The plane begins to drive away from the hangar and off the normal route as the criminal reaches for a gun, but Eda kicks his arm before he can fire at her. He locks her leg with his elbow and tries bending her knee backward, causing her great pain. As he attempts to continue steering the airplane, the CIA agent kicks the wheel, making the plane turn away and toward another plane.

The criminal steers away just in time, and as he does so, Eda charges him and advises him to give up because Kilner and the Fenians were defeated. The man warns her not to lump him in with them and elbows her face, causing her to be pushed against the throttle. As the two wrestle, they both realize the plane is now speeding toward a gasoline truck. Taking the shocked criminal off guard, Eda punches him in the back of the head and claims they are indeed not the same since he is the biggest loser. She quickly drags the criminal to the still deployed stairway and rolls onto the airstrip. Landing on her back, the pained Eda rolls onto her stomach and begins to feel in trouble upon seeing the plane collide with the truck, resulting in a violent explosion. The dizzy accomplice tries looking up, but Eda smacks his head down as she wonders how she can explain the incident, disappointed due to the mission initially going smoothly but ending in disaster at the end. Later, sitting in his office, Ravencroft is mortified to see the story in a The Washington Post article about the airport being in flames.