According to Wikipedia, http://en.wikipedia.org/wiki/Giordano_Bruno, Giordano Bruno was a mathematician, among other things, and S J Parris has written three excellent novels (and counting ..) that feature Bruno as the main character as a detective and secret agent combined:
http://www.amazon.com/Heresy-S-J-Parris/dp/0385531281
http://www.amazon.co.uk/Prophecy-Giordano-Bruno-S-Parris/dp/0007317735
http://www.amazon.co.uk/Sacrilege-Giordano-Bruno-S-Parris/dp/000731776X
