Balthazar is Damien Vesper's servant as revealed at Insider Look: Gideon and Damien and Book 11 of The 39 Clues, Vespers Rising.
Trivia
- Vesper Two might have been based off of him.
- He died in the same fire with Craven that Gideon Cahill died in, while trying to kill Gideon.
- He apparently cares for Damien Vesper, because he asks Damien if everything was all right when Damien's house ceiling "collapsed".
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