Catalyst of Pain (Cyber Hunter Origins 3) by D. B. Goodin

NYC is in chaos. As death and fighting fill the streets, she’s descending into an evil scientist’s hideaway… but this time, she might not escape.

Treeka feels like she failed her little sister. And after discovering the nefarious plans of the man who turned her sibling against her, the recently awakened cyborg and her allies stealthily infiltrate the deranged doctor’s lair. But she sees her risky mission fall apart when she’s separated from the group, and they come under a brutal attack.

Barely hanging on after being drained of energy, Treeka wakes up to the crippling aftermath of rampaging mechanically enhanced killers. And as she struggles beneath the guilt of letting her foe elude her, she sets out to stop his ruthless army from eradicating all of humanity.

Can Treeka rally her troops before it's too late to prevent the ultimate massacre?