Answer: Harry Potter and the Sorcerer’s Stone
“As for monkshood and wolfsbane, they are the same plant, which also goes by the name of aconite. Well? Why aren’t you all copying that down?” There was a sudden rummaging for quills and parchment. Over the noise, Snape said, “And a point will be taken from Gryffindor House for your cheek, Potter.” – Harry Potter and the Sorcerer’s Stone by J.K. Rowling
Also, on the TV show Dexter, the character Hannah McKay uses aconite to dispatch victims.