Jake and Terry try to solve an apparently unsolvable case, Amy lies to Holt in order to dodge work and escape for a romantic weekend away, while Gina and Rosa introduce Charles to "Babylon", their secret bathroom.
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 (guest star Kyle Bornheimer) and Gina and Rosa let Charles in on one of their best-kept secrets.—Anonymous