There are 3 books in the Cas Russell series. The newest book is Critical Point which came out in 2020.

1
Zero Sum Game

Book cover of Zero Sum Game

ZERO SUM GAME Best of Lists:
* Best Books of the Month at The Verge, Book Riot, Unbound Worlds, SYFY, & Kirkus
* The Mary Sue Book Club Pick
* Library Journal Best Debuts of Fall and Winter

A blockbuster near-future thriller, S.L. Huang's Zero Sum Game introduces a math-genius…

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2
Null Set

Null Set

S. L. Huang's Null Set is the breakout sf thriller for fans of John Scalzi and Greg Rucka

Math-genius mercenary Cas Russell has decided to Fight Crime(tm). After all, with her extraordinary mathematical ability, she can neuter bombs or out-shoot an army. And the recent outbreak of violence in the…

3
Critical Point

Book cover of Critical Point

S. L. Huang's Critical Point is a breakout SF thriller for fans of John Scalzi and Greg Rucka.

Math-genius mercenary Cas Russell has stopped a shadow organization from brainwashing the world and discovered her past was deliberately erased and her superhuman abilities deliberately created.

And that's just the start: when…