"American Horror Story" will be freaking viewers out for another season, FX confirmed Monday.

FX picked up the haunted house thriller for a 13-episode second season. The first season has nine new episodes airing at 9 p.m. Wednesdays, with the final two airing Dec. 21

Created by Ryan Murphy and Brad Falchuk, the series about a fractured family that moves into a haunted house has garnered mixed reviews but stellar ratings for FX. According to the network, its on track to becoming the highest rated first season of any FX series.

I'll give you the ratings numbers FX sent out below and let you try to decipher them. But on Halloween night, FX will air a marathon of the show's first four episodes. The fifth episode, called "Halloween, Part 2," will air at 9 p.m. Wednesday. In it, Halloween night concludes with Tate (Evan Peters) coming face-to-face with his past, and Ben (Dylan McDermott) and Vivien (Connie Britton) are haunted by one of the house’s newest guests.

Here is FX's take on the ratings numbers:

AHS is producing outstanding ratings, growing though its first four weeks in the network’s target audience of Adults 18-49. On a Live+7 basis, through two weeks, first-run episodes of AHS are averaging 4.2 million Total Viewers, 2.9 million Adults 18-49, and 1.7 million Adults 18-34. It is currently tracking to become the highest-rated first season of any series ever on FX, certain to surpass Murphy’s award-winning hit drama Nip/Tuck in Adults 18-49 and Adults 18-34 (2.1 million Adults 18-49; 1.0 million Adults 18-34 – 2003), and also above the award-winning drama Justified in Total Viewers (3.4 million P2+ - 2009).
 
On a Live+3 basis, last week’s fourth episode was the highest-rated episode of the season in delivery of Adults 18-49 (3.1 million) and Adults 18-34 (1.85 million).
 
The premiere episode of AHS (most current available) delivered a multi-run telecast audience of 8.0 million Total Viewers, 5.4 million Adults 18-34 and 3.0 million Adults 18-34.
 
The series premiere episode of AHS (Oct. 5, 10:00 PM) ranked as the #1 for the network among its target demos of Adults 18-49 and Adults 18-34. It delivered 3.14 million Adults 18-49 and 1.77 million Adults 18-34, which marked enormous gains of +54% and +49% in those demos when compared to the Live+Same Day premiere data. The debut episode of AHS also ranks #1 all-time among FX series premieres in delivery of Women 18-49 and Women 18-34.