My guess for the truth

I am thinking that; (Actually i am hoping...)

Madhurmira will be Sameer's boss and he is just her katputli. Since i think that Madhurmira cannot be pregnant and wants to take revenge she will use Shika for the baby. I am also guessing that Stalker is actually Madhu's husband. Probably after stalker found out that Sameer and Madhu are together planning something to kill Shika. He had a character change and started to look out for Shika to save her and maybe Madhu killed him. Maybe he will be back from the dead and help Shika achieve her revenge

Probably Madhu promised him something thats why Sameer is doing this as someone mentioned on this forum that Sameer said '2.5 years ke mehnaat' which probably means he doesn't want the child he just wants it to give to Madhu so she can give him his 'mehnat ka phal'

Madhu casted Sameer to be the killer so he casted the nakil parents and the stalker who he probably didn't realize is Madhu's husband.

This is all my predictions

So, I think that story could be that her father decides that only a legitimate heir can inherit the property. Maybe, the daughter---Nigaar does not want to have a baby or cannot have a baby. So, they come up with this hare-brained scheme. Am still trying to figure out where, the stalker comes in. He could be a hired goon who did this dirty work for money, or maybe he was thinking that he is helping a guy genuinely in love with this girl..., I don't know.

Let's wait and watch. This is as far as I can guess.