Mrs. Jeffries wins the prize
(Book)

The ladies of the Mayfair Orchid and Exotic Plant Society are known for a bit of friendly rivalry, but the backstabbing has never been literal--until now. When Hiram Filmore, an orchid hunter and supplier, is found dead in Mrs. Helena Rayburn's conservatory, Inspector Witherspoon is called in to weed out a murderer. When it comes out that Mrs. Rayburn and her flowery friend knew each other from long ago, Mrs. Jeffries begins to suspect that there's more to unearth about this case. Now she, along with the rest of Inspector Witherspoon's household and friends, will have to dig up the past to figure out which gardening gentlewoman had a grudge worth killing for.