Not Mushroom For Death

Why else would Detective Chief Inspector Richard Fitzwilliam suggest that Sebastiano poisoned Luca without any evidence? So now, with the help of her little dog Daisy and her best friends Perry and Simon, Lady Beatrice will have to prove to Mr Know-it-all Fitzwilliam that Seb is innocent. But with so many people having access to the food preparation area at the show how will she find out who murder Luca before Fitzwilliam lets his personal dislike get the better of him and arrests Seb?