Kilgrave Manor

On January, 1st 1928 removal men from the Royal Botanic Gardens alerted the police to a grisly discovery. The head of Professor Eugenius Kilgrave lay buried in the soil of a large plant located in the Study at Kilgrave Manor. No wounds were found to the head but the remains of the body are yet to be discovered. The shrivelled, withered, black leafed plant itself appears to have died alongside its trophy. A revolver was found nearby… as was a candlestick.

But who committed the crime? How and Why?