I agree with Ana that number four is the best. It clearly lays out the story. I did play around with it a bit but couldn’t really improve it. I am not sure how plot strong the blurb needs to be for a script. I wrote this version but it may emphasize the hero’s POV too much.
Is he a lost European prince, or the man falling in love with the nurse helping him regain his memory? One thing is for sure, he is totally bewildered when a crazy, struggling actress declares she is his girlfriend and tries to reignite her flagging career by creating a Royal fever media circus in the rural Maine town he finds himself in.