Allison looked at Alex's car entering the gate through the window of the guest room. Thankfully the window has a curtain that she can hide her face, assuming if Caroline will accidentally look up at the window.
She saw Caroline and Alex getting out of the vehicle and entered the main door.
The long-awaited visitor has finally arrived!
As much as she wants to be there in the basement, she can't reveal herself to Caroline, not the time yet!
She went back to the bed and lie down, she recalled the conversation she had with her brother earlier in the basement.
The more she thinks about it, the more she's willing to do it.
She can always hire people to kill Caroline's boyfriend. It's much easier to do. As long the killer is not caught and there's no direct evidence pointing towards her involvement in the killing then she is safe.
Well...she has lots of money to burn and she can always hire people to do the dirty job, then why not do it?