Tensions run high in the new season of "The Fosters.” Stef and Lena are called to action when Anchor Beach Community Charter school is put on lockdown after it’s discovered that Mariana’s emotionally-devastated boyfriend Nick is in possession of his father's gun. Now that Callie and Brandon’s secret is out, Callie fears that her moms may not want her to remain part of the family, while Brandon surprises the family by continuing to date single mom Cortney. Mike and Ana continue to build their relationship. Jude makes a new friend, Mariana takes on new challenges, while Jesus starts hooking up with his ex-girlfriend.