Kourtney hopes a trip to Paris will put the spark back in her relationship with Scott, who seems oblivious to her efforts to be romantic. At the same time, Kim tries to patch things up between Simon and Jonathan, but the results are less than successful.
Jonathan takes Kim's side during an argument with Kourtney, which sets the older sister off. Meanwhile, Kim learns she has a life-changing allergy; and Khloé finds herself in a strange predicament because of her love of Cuban coffee.
Kourtney would like to move out of the hotel and into a house, but she and Kim have difficulty finding the time to search for a new residence. At the same time, Scott acts overly friendly with Khloé; and the sisters help Rob cope with a bad breakup.
Kim invites her entire family to Miami to compete in a dragon-boat race. At the same time, Kourtney suspects her sister-in-law is pregnant, while Scott has trouble dealing with Bruce's competitive nature.
The Miami adventures of the Kardashian sisters are followed when Season 5 of the reality series opens with Kim and Khloé expressing concern over Kourtney's relationship with Scott. Meanwhile, Khloé tries to get Kim to open up about her impending divorce, but Kim's attention is focused on her new kitten.