I personally love the episodes where they learn the person murdered has like two separate lives (usually it’s a male, but a female would be interesting). However, maybe to be a bit unique- I broke it up into parts so that it’s easier to read
Erin York (random name) was reported missing by her husband. Normally this wouldn’t be an ‘FBI’ case, but she was / is asset to an ongoing investigation into human-trafficking. The MC and her team talk to the human-trafficking ring leader who is in jail, and they claim to have nothing to do with it. They talk to the husband, who admits to having some marital problems because she was always at work (he suspected she didn’t feel safe at home with the ongoing investigation, also mentioned they even spent a year apart a few years ago, but they were getting better. She had news she was going to tell him after the trail). However, the days she apparently works - she’s not.
The MC looks into flights and other finical abnormalities. The MC finds gas purchases in a town reasonably far from where Erin lives. There’s no family in that town or work related reasons. They look in phone records to match area codes, but don’t find anything. However, the landline received one call from the area code. The Husband recalls last week when a child called the phone asking for “Mommy” - Erin told the husband to drop it, it was just a prank. Around this time, they learn the owner of the phone number and it tracks to a cell phone of Josh Cardinal, a person suspected to be apart of the trafficking ring.
Finally, the MC goes to the house and finds it trashed with everything broken and burnt - but most importantly, there are images of Erin having a second family with Josh Cardinal (Anger Issues, has a record) with a son (or daughter) who is around four or so. Back at the jail, the MC asks the Trafficking leader the relationship between the Josh and Erin, but they are overly cocky about it and don’t give any information. Meanwhile, there’s pressure from above to drop the case (or kill Josh if the MC finds him) because if it’s learned Erin has a ‘double’ life, her knowledge about the trafficking ring will be tossed out the window, and the bad guy will escape.
The team reviews what they know. The kid would have been born during Erin & her husbands one year apart, but would have been conceived when they were together (she cheated). They let the husband know, and during this time, the medical records show that Erin is pregnant. The team now believes that Erin (and child) have been kidnapped by Josh. They also find papers inside the house to ban Josh from Erin (and the child)'s life. The MC activates an Amber Alert- and they get a lead.
This lead pans out and they storm a cabin in the middle of know where, where Erin and the child are being held hostage. The regular shoot out and such- yadda yadda - Erin and the Child are saved and Josh in cuffs. However, now since Erin’s testimony is now invalid, the team convinces Josh to testify instead in return for some time with his child (in his delusion, Josh wanted a happy family with Erin & the child). All parties agree. Happy ending, Erin’s husband meets the child, and he’s totally jazzed about it (even more since Erin tells him that’s she’s pregnant with a child). Drug Trafficker ring leader is in jail (and I guess vows revenge if you want him to return)
or alternative ending, Josh dies and the ring leader is let out of jail - and likely going to be back in the MC’s life.