Charles and Genevieve (guest star Mary Lynn Rajskub) want to take their relationship to a new level, but his ex-wife, Eleanor (guest star Kathryn Hahn), 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 in the all-new “Hostage Situation” time period Premiere episode of BROOKLYN NINE-NINE airing Tuesday, January 5th on FOX.