As far as I know, that move is not in any book. As you might expect, it probably is not very good on close inspection. But proving that upon first encounter is another story--especially late at night at ICC, with a full moon overhead. I have been enjoying playing the Werewolf quite a bit these past few days. And I'm just itching to play it again.
For those interested in learning more about the mainline Frankenstein-Dracula, I suggest the articles by Tim Harding at ChessCafe:
- Frankenstein and Dracula at the Chessboard
- Winning by One Tempo: Clever or Not?
- Dracula Has Risen from the Grave, or Has He?
- Putting Dracula Back in His Coffin
- Interview with a Chessplaying Vampire
You might also enjoy Vienna Backwaters by IM Andrew Martin, which offers an introduction to Santasiere's forgotten surprise gambit alternative to the Frankenstein-Dracula that may be even scarier: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.d4!?