The precinct heads to Tactical Village Day, a mandatory training course in which all regional precincts compete. While there, Amy runs into Teddy, a fellow officer she used to date. Meanwhile, Holt becomes addicted to a game on his phone and Rosa is pissed at Charles for not inviting her to his wedding.

When Jake gets the weekend off, he decides to take on a cold case that everyone thinks is unsolvable, but with the help of Terry, the two try to crack the case once and for all. Meanwhile, Amy plans a romantic trip with Teddy and Gina and Rosa let Charles in on one of their best-kept secrets.