S. L. Huang

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, and she'll take any job for the right price. As far as Cas knows, she's the only person around with a superpower...until she discovers someone with a power even more dangerous than her own. Someone who can reach directly into people's minds and twist their brains into Moebius strips. Someone intent on becoming the world's puppet master. Cas should run, like she usually does, but for once she's involved. There's only one problem... She doesn't know which of her thoughts are her own anymore.

An anthology of "best of" short science fiction published in 2019.

Cas Russell uses her extraordinary mathematical ability to fight crime. Unfortunately, her power has a history she can't remember or control. To complicate matters, she's gotten herself on the hit list of every crime lord on the West Coast.