Major Crimes is called to the scene of a murder. The victim is a Hispanic male who may have been part of the MS-13 gang. Tao finds a radio that doesn't seem to fit with the rest of the crime scene. He gives it to Haley Williams to process.
All of a sudden there is a huge explosion. Haley is killed and the victim's daughter, Sofia, is injured.
Winnie Davis gets on TV and announces the LAPD is the victim of a terrorist attack before anyone has decided any such thing has happened. This sabotages Major Crimes' plan to keep the attack quiet.
At the morgue, the ME is showing the detectives his findings when Davis shows up. She and Flynn argue about whether this was really a terrorist attack. Davis is of the opinion that if an LAPD officer gets hurt, it's terrorism whether or not the perp intended it to be, because all cops could be in danger from a bomb like this.
The perp punches a kid in the park for seemingly no reason. When the cops get there, they find a bike which is taken back to evidence.
Rusty and Gus have yet another stupid fight because Gus has decided to take a job upstate and expects Rusty to be so excited for him that he'll drop everything and move with him, even though Gus has never discussed the subject with him before and Rusty just found out Andrea wants to hire him after his internship is over.
Meanwhile, the cops continue to argue with Davis, who won't stop calling the attack terrorism. Nolan and Davis exchange words and Raydor warns Nolan to follow protocol for dealing with commanding officers. She also claims she doesn't want to be anywhere but here.
The perp calls the funeral home to find out when Luna's funeral will be. Major Crimes interviews a jailhouse snitch who says that the perp, Christian, was insane and hadn't forgiven his wife for cheating on him 11 years ago. The cops discover the wife was Luna's other daughter.
Everyone is evacuated from the funeral site but a bomb goes off. Rusty and Flynn watch in horror, not knowing whether or not Sharon is okay.