If there's one member of the Kardashian-Jenner clan you should never mess with, it's Kim. In a new clip from the upcoming Season 14 premiere of Keeping Up with the Kardashians, there's a definite feud brewing between Kim and Caitlyn Jenner. 

In the clip, Kim and her sisters are outraged after reading excerpts from Caitlyn's biography, The Secrets of My Life, in which she makes some startling claims about the Kardashians' father, Robert. The claims make specific reference to the notorious O.J. Simpson trial, in which Robert was part of the defense team. 

Here's what we know so far about the drama. 

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In the clip, Kim reads a passage from Caitlyn's book that says, "Robert Kardashian knew O.J. Simpson was guilty, but joined the defense team to get back at his re-married ex."

In the clip, Kim reads a passage from Caitlyn's book that says, "Robert Kardashian knew O.J. Simpson was guilty, but joined the defense team to get back at his re-married ex."
Instagram |  @kimkardashian

Kim continues reading the passage to her sisters, saying, "Robert told Caitlyn in secret after the O.J. murder that he believed his friend was guilty."

"Dad so believed in him," Kim then adds.  

"Dad so believed in him," Kim then adds.
Instagram |  @kimkardashian

"It is so shady that Caitlyn came over and gave me the book, and then on the phone she said, 'Well, the final version has a few more things in it, but don't worry it's nothing about you.' So she lied to me, because that is about me if it's about our dad," she continues. 

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"She is a liar. She is not a good person," Kim says to her sisters, who are equally upset about Caityln's allegations.

"She is a liar. She is not a good person," Kim says to her sisters, who are equally upset about Caityln's allegations.
Instagram |  @kimkardashian

"Like, to sell a book, you're gonna make something up?" Kourtney asks at one point. 

Kim ends by admitting, "My relationship with Caitlyn was strained. I was just trying to be respectful." 

Kim ends by admitting, "My relationship with Caitlyn was strained. I was just trying to be respectful."
Instagram |  @caitlynjenner

"But if you talk about my dad, I will cut you," she warns. 

We're betting this season will be a juicy one. 

Catch the Season 14 premiere of Keeping Up with the Kardashians on October 1st!