Deadly. Mercenary. Superhuman. Not your ordinary math geek.
The vector calculus blazing through Cas Russell's head lets her smash through men twice her size and dodge every bullet in a gunfight. In this action-packed series, Cas faces opponents as powerful as telepaths and as unstoppable as mobsters. She's not the only person in the world with a superpower or the technology to mimic one -- but how many can claim a mastery of the whole numerical world as their battle skill? Adrenaline, snark, and science fiction combine into noir superhero thrillers.