A murder investigation turns explosive while Captain Sharon Raydor duels with Deputy Chief Winnie Davis (guest star Camryn Manheim) for control of her case as she and her squad try to determine if they are dealing with a terrorist. Meanwhile, Rusty gets some alarming news from Gus.

After discovering the identity of the bomber her division has been searching for, Sharon Raydor and the Major Crimes squad struggle to determine his next target.