Castle Lord Wanted Urgently

A small town with a castle that fell into ruin several hundred years ago. To attract more visitors, the town council invents an ancestor of the last, long-dead lord of the castle and makes the story public. Only the town council and the mayor know that he doesn't exist. But this draws a crowd of curious onlookers, including journalists who want to write about it and genealogists. The local heritage association also wants to introduce him and organize a festival for the occasion. This gradually puts the mayor in a bind.
Will this hoax be exposed, or will a lord of the castle be found after all?