Cas Russell is good at math. Scary good. The vector calculus blazing through her head lets her smash through armed men twice her size and dodge every bullet in a gunfight. She can take any job for the right price and shoot anyone who gets in her way.

As far as she knows, shes the only person around with a superpower...but then Cas discovers someone with a power even more dangerous than her own. Someone who can reach directly into peoples minds and twist their brains into Moebius strips. Someone intent on becoming the worlds puppet master.

Cas should run, like she usually does, but for once she's involved. Theres only one problem: She doesnt know which of her thoughts are her own anymore.