There's a possibility that it's a family member of a criminal she arrested. They might be seeking justice in their own twisted way. They could have been planning the attack for a long time, waiting for the perfect moment to strike when Burgess was most vulnerable. Another suspect could be a corrupt cop from another precinct who doesn't like the way Burgess and her team are cleaning up the streets and cutting into their illegal activities.
It could be an old enemy of Ezra. Maybe someone from his past who has a grudge against him for some reason, like a business deal gone wrong or a personal feud.
Perhaps it was someone within Toby's own group who had a hidden agenda. A so - called friend who was jealous of Toby or had some ulterior motives that led them to arrange for the shooting. This would add a lot of drama and betrayal to the fanfiction story.
Perhaps a new character who has a hidden agenda. Maybe someone who has a connection to a current case Gibbs is working on and doesn't want him to get too close to the truth. This person might be working for a larger criminal organization and sees Gibbs as a threat.
It could be someone from a past case she worked on. Maybe a criminal she put away who has a vendetta against her and managed to get out on parole early. They might see shooting her as a way to get revenge for the time they spent in jail because of her.
Well, the plot could start with the immediate aftermath of Erin getting shot. There'd be chaos at the scene, her colleagues in shock. Then it might focus on the investigation into who shot her. Maybe it was a criminal she put away who had connections on the outside and arranged for the hit. The story could also involve her struggle in the hospital, dealing with pain and the fear of not being able to return to work.
Perhaps a mysterious stranger who has some unknown vendetta against the Heartland family. This person could have been lurking around the ranch for a while, waiting for the perfect opportunity to strike. Or it could be someone within the community who has a hidden agenda and sees Amy as an obstacle to their plans.
One possible plot development could be her fellow officers' reactions. They might be filled with rage and determination to find the shooter. For example, they could start an intense manhunt across the city, questioning every possible suspect. Another aspect could be Burgess's own struggle in the hospital. She could have flashbacks of her time on the force and the cases she worked on, which gives her the will to fight for her life.
Well, in such a scenario, the other members of the Chicago PD might launch an all - out search for Burgess. They could start by interviewing witnesses who might have seen Gaines or any suspicious activity. Maybe they'll find some clues at the scene of the kidnapping that will lead them to where Gaines is hiding Burgess.
Well, perhaps a new character introduced in the fanfiction. Maybe a spy from a rival agency who sees Abby as a threat to their mission. Or it could be an associate of a major criminal that the NCIS has been investigating. They might think that by shooting Abby, they can disrupt the investigation. Also, it's possible that it's a person with a personal vendetta against Abby, like someone she unknowingly wronged in the past.
It could be an ex - boyfriend who is jealous of Annie's new relationships. Maybe he couldn't handle seeing her move on.