The era of serial dating and serial killing is over for Karrie and Zoe.

An emergency call on Christmas brings the goth, true crime podcaster, and serial-killer barbie into a hotbed of mafia activity.

When Zack lies to the girls in order to jet to Seattle, Zoe is suspicious. When he shows up back at home with a man named Nick Farelli-mafia enforcer and gentleman germaphobe-Zoe's growing anxiety might be more than unease around a fellow murderer.

Karrie impatiently waits on an answer to an important question, Nick realizes someone is trying to kill him, Zoe sharpens her knives, and Zack wonders why she has so many.

Dead bodies, secret prison visits, and kidnappings bring a dangerous killer back to their doorstep-but this one doesn't love hot pink.