To Conjure a Killer — Clea Simon

Becca Colwin is coming home from her job at Charm and Cherish when she sees a tortoiseshell kitten run down an alley-leading to a dead body. As a connection between Becca and that corpse is confirmed, Becca comes under suspicion-and is dragged into a cyberware scandal, thanks to her cheating ex, Jeff. The unfaithful computer geek and his high-power investor were working on stealth software designed to record and transmit personal data-a new form of spyware that would be of interest to everyone from the police and security agencies to cybercriminals. And when Jeff's former friends and colleagues approach her, Becca finds the police aren't the only ones watching her.