Victorian aristocrat Charles Lenox is a true gentleman, always ready to perform a noble deed. Therefore, when his childhood friend Lady Jane asks him to conduct his own, private investigation into the circumstances of the death of her pretty maid Prudence Smith, Charles obeys - and immediately notices the extremely strange circumstances of the case. At first glance, Prudence clearly committed suicide. But where did a simple servant get the rare, exotic poison that caused her death? So it's still murder? Charles begins to ask questions - but before he can come to any conclusions, the killer strikes again...