Can you tell me a whodunnit mystery set in an old manor. I want a story with four suspects, and for each suspect I need to know the motive and the alibi. In addition I would like to know also how the detective was able to exclude each suspect and identify the killer
Here's a short story that fits your criteria:

Title: The Mystery of the Manor's Missing Ruby
Setting: An old manor in England during the 1920s
Detective: Inspector Smith

Four Suspects:

- Lady Emily, the owner of the manor - motive: financial difficulties; alibi: she was attending a society event in London at the time of the theft.
- Lord James, Lady Emily's husband - motive: gambling debts; alibi: he was locked in his study working on important documents.
- Mrs. Hudson, the housekeeper - motive: revenge against Lady Emily for firing her son; alibi: she was in the kitchen preparing dinner.
- Mr. Brown, the gardener - motive: to sell the ruby and leave the country; alibi: he was working in the greenhouse.

Detective's investigation:

Inspector Smith interviewed each suspect and thoroughly examined the manor. He was able to exclude Lady Emily as a suspect by verifying her alibi with multiple witnesses at the society event. He also found that Lord James's study was indeed locked from the inside and ruled him out as a suspect. The detective discovered that Mrs. Hudson had a key to the study, but her alibi was verified by the cook, who saw her in the kitchen at the time of the theft. Mr. Brown, the gardener, had no opportunity to steal the ruby as the greenhouse was located on the opposite side of the manor and he was seen by other staff members at the time of the theft. Inspector Smith's investigation led him to the unexpected suspect, the butler, who had stolen the ruby to pay for his daughter's medical treatment. The butler confessed and returned the stolen ruby. In conclusion, Inspector Smith was able to solve the mystery by thoroughly investigating each suspect and their alibis, and ultimately discovering the true motive and culprit.
Could you elaborate on Mr Brown's motive?