Evie is just her current alias. She has been many people since working for Mr. Smith. But her current assignment starts to go sideways when someone impersonating her real identity shows up. 

Evie has been working for Mr. Smith for years, being used and manipulated into doing his dirty work. She very smart, but it seems like he has always been one step ahead of her. She seems a bit naive, but she is incredibly cunning and resourcful. We learn that

Evie has been planning Mr. Smith's takedown for years with her small team, Devon and Amy. As Mr. Smith tries to take Evie down, they are secretly discovering his secrets and true identity.

I had an idea of where this was heading, but

I thought Ryan was going to be Mr. Smith, not the UPS guy! It makes sense that he would always want to be close and keep a close eye on her.

I felt that the ending was a bit cheesy, but

it is interesting that she becomes Ms. Smith and takes over.