Anchor Beach Community Charter school is put on lockdown when it's discovered that Mariana's emotionally-devastated boyfriend Nick has burned down his father's warehouse and is in possession of his father's gun.

Nick is angry at Mat and decides to start shooting at the school. During the lockdown Callie and Brandon talk to Stef and Lena about their past decisions. Jesus and Emma discuss getting back together. Jude and Daria get locked in a room together.