I truly love this film. The look on young Graham's face when he got his first chemistry set was probably like the one on my own when I got mine. Because I loved my family, I chose other areas of research and never experimented on them. That said, I found the humor in this black comedy right on target and I actually felt sorry for the young poisoner. If he had worked for Q branch he most likely would have received a knighthood rather than a prison sentence. I have no idea how close to the truth this movie is but it is on my top 20 films of all time.