Charles and Genevieve want to take their relationship to a new level, but his ex-wife, Eleanor, steamrolls their plans. Meanwhile, Amy asks Terry to write a recommendation letter with disastrous results, and Holt and Rosa enlist Gina's help to solve a case.

Jake and Amy are excited to go on their first real vacation together, but Amy's perfectly planned cruise ship itinerary is thwarted when they discover an old adversary is on board with them. Meanwhile, Gina and Terry help Captain Holt survive a visit from his sister, Debbie, and Charles and Rosa vie for the same apartment.