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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, she's 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 people's minds and twist their brains into Moebius strips. Someone intent on becoming the world's puppet master.

Someone who's already warped Cas's thoughts once before, with her none the wiser.

Cas should run. Going up against a psychic with a god complex isn't exactly a rational move, and saving the world from a power-hungry telepath isn't her responsibility. But she isn't about to let anyone get away with violating her brain -- and besides, she's got a small arsenal and some deadly mathematics on her side. There's only one problem...

She doesn't know which of her thoughts are her own anymore.

Cas Russell is back -- and so is her deadly supermath.

Cas may be an antisocial mercenary who uses her instant calculating skills to mow down enemies, but she's trying hard to build up a handful of morals. So when she's hired by an anguished father to rescue his kid from an evil tech conglomerate, it seems like the perfect job to use for ethics practice.

Then she finds her client's daughter... who is a robot.

The researchers who own the 'bot will stop at nothing to get it back, but the kid's just real enough for Cas to want to protect her -- even though she knows she's risking everything for a collection of metal and wires. But when the case blows up in her face, it plunges Cas into the crossfire of a massive, decades-long corporate espionage war.

Cas knows logically that she isn't saving a child. She's stealing a piece of technology, one expensive and high-stakes enough that spiriting it away is going to get innocent people killed. But she has a distraught father on one hand and a robot programmed to act like a distraught daughter on the other, and she's never been able to sit by when a kid is in trouble -- even a fake one.

Screw morals and ethics. All Cas wants to do is save one little girl.