In the year 2046, a cop and his female android partner called Armitage, part of the latest android line known as "class III" models that look, act and feel human, investigate illegal manufacture of class III androids on colonized Mars.
Armitage, a saucy Martian cop, and her partner, Sylibus, track a killer who is revealing his female victims' identities as highly-advanced androids. Sylibus discovers that Armitage is one of them before witnessing her dramatic standoff with the murderer.
The killer, D'anclaude, is in custody, but the androids, called Thirds, are still dying. Armitage's disappearance leads Mars PD to suspect that she's involved in the murders. Only Sylibus knows why she has taken the case into her own hands.