Complete story — includes the ending
Jake tries to help Amy prepare for a sergeant's exam, but unknown to him, Amy is avoiding the exam because becoming Jake's superior could have a negative effect on their relationship. Meanwhile, Gina is bequeathed an important Boyle family heirloom that belonged to Charles' recently deceased aunt, but she accidentally destroys it. Terry and Holt build a model train set for the kids in the lobby to enjoy and compete over which set is more appealing.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Brooklyn Nine-Nine season 4. HTML formatting and reference markers removed. · Content license