There are various sites for Hart to Hart fan fiction.
If you want to write fan fiction please contact the  following sites directly . I am not involved in these sites, I am only listing them here.

If you wish to include your site email  Nolene by clicking on the  Hart's mailbox below

 

Click here to go to Susan's Hart to Hart Fan Fiction Archive

Click here to go to Marie's  JJ's Room

 

Click here to go to Nancy's Hart to Hart Fan Fiction

 

Click here to go to Jan's Fan Fiction Shelf