Tensions run high as Stef and Lena are called to action when the school is put on lockdown after it's discovered that Mariana's boyfriend Nick brought a gun on campus
The Adams Foster household's on lockdown in their own home following the crisis at school; and Callie and Brandon anxiously wait for their mothers to address their behavior in Idyllwild. Meanwhile, Stef's furious when she discovers Brandon snuck out to help Cortney move.
Callie gets suspended after she reacts inappropriately to some taunting, but things start looking up for her when she meets a young law student. Meanwhile, Mariana's classmates fault her for Nick's actions; and Jude is invited to Taylor's youth group.
Callie starts her senior project of photographing the outside of her and Jude's seven former foster homes. But, when an unexpected encounter with a former foster mother brings her inside, Callie decides to reach out to other people who have fostered her and is shocked to learn that a 17-year-old former foster brother has been convicted of murder. Stressed out by the hardships of supporting himself and Cortney, Brandon throws a house party and things take a turn for the worse. Stef and Lena offer to pay for an attorney to help get Gabe off of the sex offender registry, which is currently putting Lena's job at risk and causing friction between Mike and Ana.
Lena is excited that her family is coming together to throw her a 70s-themed 40th birthday party. But, when Lena's mom Dana shares her suspicions about Stewart's behavior, it threatens to put a damper on the festivities. Convinced her former foster brother Kyle has been wrongly convicted of murder, Callie and Aaron try to track down a witness in the case. Mariana and her female STEAM club teammates compete for an invite to the Regional Robotics Competition.
Lena and Stef grow concerned about the tax on their house and how it could affect the family; and Lena confronts Brandon about the money he gave to Cortney.
When Jesus's birth father, Gabe, doesn't show up to work on Stef and Lena's garage, Jesus takes on the job himself and gets injured in the process. An exhausted Mariana, deep into her robotics STEAM project, takes Jesus' ADHD medicine for a boost. Callie and AJ find themselves in an awkward situation when Mike and Brandon unexpectedly come home early. Meanwhile, Stef lets Mike know that Brandon gave his hand injury settlement money to Cortney.
Callie does volunteer work at Girls United, where she learns that neighbors want the girls removed, and one resident harbors a dangerous secret. Elsewhere, Mariana and Hayley prepare a romantic meal for their dates; and Ana sends Stef a troubling letter.
Brandon travels to New York City for his Julliard audition and meets a girl who forces him to take a hard look at his life, including his relationship with Cortney. Meanwhile, Stef and Lena make an unexpected announcement that leaves the family in shock. And Callie's friendship with Aaron causes friction between her and AJ.
Callie and the family set up a Justice for Jack booth at a music festival in hopes of stopping Justine's foster-care bill; and Callie's interest in reopening Kyle murder's case puts her in danger.
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