The setting is an old manor, where a wealthy businessman was murdered. The four suspects are the butler, the maid, the gardener, and the businessman's wife.

The butler had a motive of greed, as he was promised a large sum of money by the businessman's wife if he helped her get rid of her husband. The butler's alibi was that he was in the kitchen preparing dinner at the time of the murder.

The maid had a motive of revenge, as she was fired by the businessman for stealing from him. The maid's alibi was that she was cleaning the upstairs bedrooms at the time of the murder.

The gardener had a motive of jealousy, as he was in love with the businessman's wife and was jealous of her relationship with her husband. The gardener's alibi was that he was outside in the garden at the time of the murder.

The businessman's wife had a motive of inheritance, as she stood to inherit a large sum of money from her husband's estate. The wife's alibi was that she was in her bedroom at the time of the murder.

The detective was able to exclude each suspect by finding evidence that proved their alibis were false. For example, the butler's fingerprints were found on the murder weapon, the maid's footprints were found near the scene of the crime, the gardener's DNA was found on the victim's clothing, and the wife's motive was confirmed by a witness who saw her arguing with her husband shortly before the murder.

In the end, the detective was able to identify the killer as the businessman's wife, who had hired the butler to help her carry out the murder.
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