Kris is furious when some slanderous rumors circulate on the 25th anniversary of her friend's murder; Kim struggles to disconnect from work while on a trip to Costa Rica; some of Khloe's past insecurities resurface when she attends her first prom.

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.