Kourtney flies to Los Angeles to have it out with sister Kim, who is planning to "borrow"—without permission—Kourtney's house for North's birthday bash. Meanwhile, too much partying in the Hamptons lands Scott in the hospital, and to the realization that things need to change.

Scott decides to check into rehab, but has second thoughts once his stint begins; at the same time, Khloé has mixed feelings about her approaching 30th birthday since her life isn't turning out as planned.

Kourtney and Scott try avoiding making past mistakes again. Kim doubts her best friend's loyalty.

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When Khloé revives her love for horseback riding, Scott and Kourtney make a bet on how long she will last; Kourtney and Kim try to break Kris's crabby mood.

When Scott is consumed by his negative affiliations with the Hamptons, he chooses to leave early; Khloe and Kourtney hire a new Dash Doll as a favor to Bruce.

When Khloé enjoys a night of drinking, Kourtney get angry and accuses her of recklessly putting Scott's sobriety in jeopardy; Meanwhile, after Malika drunkenly kisses Khloé, Khloé starts to question what their friendship really means.