Only sixteen, Harriet Duncan is determined to bring her mother to justice for her father’s murder. When she happens upon an outlaw with amnesia she struggles to convince him that he’s an heroic bounty hunter who has offered his help.

Good point raised by DPG.

Look at True Grit as a good example.

Having an ally who can be duped into helping her because he's an amnesiac doesn't work for me. She's enlisted the help of a someone obviously not playing with a full deck of cards. Where did she find this guy? Why does she think he could be of any use to her? It seems like a gimmick for the sake of a differentiating gimmick.

And if I did buy the character, wouldn't it be the case that what he needs to be duped into believing is that he is an "heroic detective" not an "heroic bounty hunter" -- big difference in job descriptions.

I think it would be better that they are both characters playing with a full deck of cards, an Odd Couple who bond over a common need, mutual stakes.

Having an ally who can be duped into helping her because he's an amnesiac doesn't work for me. She's enlisted the help of a someone obviously not playing with a full deck of cards. Where did she find this guy? Why does she think he could be of any use to her? It seems like a gimmick for the sake of a differentiating gimmick.

And if I did buy the character, wouldn't it be the case that what he needs to be duped into believing is that he is an "heroic detective" not an "heroic bounty hunter" -- big difference in job descriptions.

I think it would be better that they are both characters playing with a full deck of cards, an Odd Couple who bond over a common need, mutual stakes.