Sam is arrested for murdering a woman, but Callen and Granger work to clear his name. Meanwhile, Kensi and Deeks discover a link between the victim and a student from Sam's past.
The murder of a train yard security guard sends the team and Homeland Security after a mastermind who may be plotting a terrorist attack on a train.
Detective Lovato's past as an undercover officer tangles up with her present duty when one of the gang members she ingratiated herself in and developed feelings for turns up tortured and killed.
Jax scrambles to put his affairs in order, while Nero handles business with his old crew.
Complications arise as the Sons band together to face a new adversary.
Susan convinces Mike to go to the police when she discovers that Ben's loan shark is out to get him, which could have dire results. Meanwhile, Gabrielle is justifiably concerned when Carlos exhibits some strange behavior on his first day back to work, and Tom's girlfriend, Jane, drops a bombshell on Lynette during Penny's birthday party. In the meantime, Mrs. McCluskey, who is suffering from terminal cancer, asks Bree to help put an end to her life.moreless
When an anti-cult activist is murdered, Jane must determine if cult leader Bret Stiles is responsible.
Both friends and familygather at thehospital for the birth of Amy's baby.Meanwhile,George and Ashley move out of the house.