Taipei. Brilliant surgical resident Ian Chang silences the tremor that could end his career with NT-13, a neural blocker he synthesizes himself.

But when the drug wears off, someone else wakes up: Hyde. Elegant, barefoot, and convinced he is the city’s surgeon, he excises the people the law let go. Every body he leaves behind holds the snapped tip of a No. 15 scalpel.

And the detective on the case is Ian’s own big brother, Jay.