[youtube=http://youtu.be/0ufaW_s6jpQ] Brooklyn Nine-Nine: Unsolvable (1×21) Summary: Feeling restless after a hot streak and seeing Santiago with her boyfriend, Peralta decides to reopen an unsolved case. Diaz helps Boyle with his Vivian issues by showing him the best kept secret in the 99. Santiago lies to Holt and accidentally digs a bigger …