Second in Huang's series of thrillers featuring Cas Russell, a mercenary with superhuman math skills. (Second in the Tor edition anyway. Originally this was book 4 I understand.)
In this one Cas deals with a crime wave resulting from the events of book one, and comes dangerously close to remembering parts of her past she shouldn't. Less fresh than the first one, but still fun and still stretching the limits of suspension of disbelief.