Creative writer & psychologist needed

We are looking for a creative writer preferable woman & psychologist, who will be able to express the feeling. The job is to write a heartbroken letter which will be distributed to couple people. Writer must know to work with couple points only. The letter must be short but effective. People during the reading must feel that there has to be an action and must be stop the unfair treatment. The letter must mobilise them.
Please note we prefer native English speaker only.