Andy Samberg, Andre Braugher Andy Samberg, Andre Braugher

Is there a traitor in our midst? That's the big question facing the squad when Brooklyn Nine-Nine returns.

In this exclusive sneak peek from Sunday's new episode (8:30/7:30c, Fox), Capt. Holt (Andre Braugher) informs Jake (Andy Samberg) that the entire squad is under investigation. "Apparently someone has been leaking classified information to a criminal syndicate," he tells Jake.

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Despite the leak, Jake is adamant that there is no mole, and he takes a huge leap of faith to prove it to Holt. Watch the exclusive video below:

Brooklyn Nine-Nine airs Sundays at 8:30/7:30c on Fox. Who do you think the mole is?