How Many Poisoning Stories Can There Be?

So it's Thanksgiving break and I'm with my wife (formerly known here as Heather) visiting the in-laws. And we also visited one of my favorite places on earth: McKay's Used Media (or some such) where you take in the books your tired of and the cd's that no longer have any relevance whatsoever and they give you credit to get more books that you might one day tire of. I'm wandering the creative writing reference aisle, and I see this catchy title Howdunit: The Book of Poisons . It's part of the W...