When Tristan starts showering Khloe with gifts, she worries his grand gestures are an effort to win her back. After Kim and Kourtney learn that people are being sickened by toxic waste in a nearby community, they vow to help. Kris gives Khloe an unforgettable birthday present.

Kim and Kourtney plan a joint birthday party for their daughters, but a disagreement over candy puts the special day in jeopardy. Kris is concerned about some of Khloe's obsessive behavior and enlists the help of a professional. After receiving criticism over the name of her shapewear line, Kim faces a difficult decision about the future of her company.

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When Khloe's ex-husband Lamar releases a memoir that includes details about their relationship, she considers reconnecting with him for the first time in years. After an old rumor resurfaces, Kris worries that it will spark a fight between her and Khloe. Kim is nervous to speak at a live press conference at the White House. Scott thinks his dog has what it takes to win Best in Show.

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Kourtney and Scott approach the family for parenting advice, but some unwelcome input from Corey leads to a blowout argument between him and Scott. Khloe plans a wine-tasting trip to Napa to check in with Kylie and see how her sister is handling some significant life changes. The family is fed up with Kim's new intense security protocol, so they take matters into their own hands.

Khloe must figure out how to coexist with her ex for her daughter's sake after an uncomfortable confrontation with her ex at True's first birthday. Kim accuses Kourtney of copying her style, causing a rift between the sisters on the eve of Kourtney's big birthday celebration. Kim searches for answers regarding a frightening medical diagnosis.

In the aftermath of Tristan's shocking betrayal, Kim and Kourtney take Khloe on a getaway to help her cope with the news. Khloe's anger reaches a boiling point when she learns that Jordyn is speaking publicly about what happened, causing her to lash out. Kylie has a decision to make about the future of her relationship with her best friend.