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 as Major Crimes heads for an explosive season finale.
A detective from Las Vegas is found dead of an apparent drug overdose but further investigation reveals that he was poisoned. Meanwhile, Daniel Dunn's recent behavior makes Raydor and Rusty wonder if he can be trusted.
A sniper kills a judge, and both Major Crimes and the FBI try to get to an eyewitness who can identify the shooter before the shooter can kill him. Meanwhile, Sharon takes steps to protect Rusty from his father.