Max is in heat again, ready to jump at any men, even Normal! She hates her condition and is ashamed of it. Meanwhile, she is avoiding Logan at all cost and decides to cancel their anniversary dinner. After the day is over, she confronts the still-confused Logan about her condition and the two finally admit their feelings towards each other. Just as they are kissing, Zack interrupts with bad news about Tinga. They must go rescue her from a secret government facility.

Max and Logan must set aside their complicated and lethal feelings for one another, when they investigate a series of unusual deaths and uncover a genocidal agenda linked to transgenic escapees.

On Halloween night, Max finds her "normal" world turned upside down when the creatures she let out of Manticore are able to walk the streets freely without fear of exposure. As she and Joshua, with a crazy band of characters, race against time to find a headless body before it carries out its intended lethal mission, Max is faced with the reality that Asha and Logan are getting closer than ever.