Psychological Detective Joseph and Irrelevant Evidence

A pot of disappearing flowers was the only "stolen" he took away. When confidential data from the Earl's laboratory was stolen and the suspected gardener was shot dead by the police, the case seemed to be over. However, what psychological detective Joseph Anderson was hired to investigate was a pot of flowers that was mysteriously missing from the scene. It had nothing to do with the theft, but it became the last obsession of the desperado.