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.

The episode was rated 7.80 from 490 votes.

In the aftermath of the school lockdown, Mariana is called out by other students who blame her for Nick’s actions. Callie is also taunted at school and her inappropriate reaction gets her suspended. But what starts off as a punishment turns into an adventure when she meets Aaron, a handsome young law student who knows nothing about her or her past. Meanwhile, when Taylor invites Jude to her church youth group, he questions her motives.

The episode was rated 7.81 from 502 votes.

Stef starts a new assignment in human trafficking where she meets a young girl turning tricks on the streets.

The episode was rated 7.84 from 553 votes.

Sharon and Will (guest stars Annie Potts, "Chicago Med," and Rob Morrow, "Billions") return to the Adams Foster home with news that they are engaged. While the family happily prepares for the wedding ceremony, Stef learns that her mom is having second thoughts about getting married. In an effort to come clean with Jesus, Emma writes him a letter but learns he is hiding a secret of his own. Meanwhile, Jude is teased at school when Lena organizes an LGBTQ-friendly sex ed class for students.

The episode was rated 7.87 from 564 votes.

Mariana and Jesus compete in the First Robotics Southern California Regionals, but when Mariana gets too competitive under the stress, Lena grows alarmed. Callie gets a warning from the police to stop harassing Patrick Molloy. Brandon practices for his fast-approaching Julliard audition.

The episode was rated 7.87 from 460 votes.

Callie awaits her hearing in juvie while Jesus remains in the hospital; Stef and Lena struggle to cope with all of the issues going on in their family.

The episode was rated 7.88 from 594 votes.

Jesus sustains an injury after he tries to cover for his father who didn't show up for work. Meanwhile, Mariana takes Jesus' ADHD medication after feeling drained; Callie and AJ are caught in an awkward situation when Brandon and Mike arrive home early; and Stef tells Mike that Brandon gave his settlement money to Cortney.

The episode was rated 7.90 from 467 votes.

It seems just about everyone in the Adams-Foster household has a secret, but unfortunately for each of them, they all start spilling out. With Callie’s court date inching closer, Robert’s attorneys present a defense strategy that Callie vehemently opposes. Monte and Lena join forces to stop Drew’s underhanded dealings. Stef works to bust Diamond’s pimp. Jesus asks Gabe to keep a secret from his moms.

The episode was rated 7.90 from 549 votes.

Lena is at her wit's end when everyone comes to her to handle all their crises and Stef is never around to help. Aaron invites Callie on a road trip to visit his parents.

The episode was rated 7.92 from 541 votes.

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.

The episode was rated 7.93 from 483 votes.

In the season finale, Callie faces a life-changing decision to take a plea deal and go to jail for three years, or go to trial and risk an even longer sentence. Even though Callie struggles with her own situation, she tries to help Diamond.

The episode was rated 8.01 from 563 votes.

In the aftermath of Jesus’ fight with Nick over Mariana, Jesus is knocked out. On the way to the hospital, things take a turn for the worse, leaving him fighting for his life. Meanwhile, Callie finds herself in a dangerous situation after taking a ride with Troy and Mariana is guilt-ridden over the fact that her actions led to Jesus’ current condition.

The episode was rated 8.04 from 600 votes.

After being given the all clear to head home, tensions are still running high in the Adams Foster household. Fragile and skittish from the school lockdown, the family sticks close, but their secrets keep them apart. Callie and Brandon anxiously wait for their moms to address their behavior in Idyllwild while Stef warns everyone to stay off their phones and computers due to the rumors swirling around their family. Meanwhile, Brandon sneaks out to help Cortney move, leading to a major blowup between him and Stef.

The episode was rated 8.06 from 509 votes.

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 his father’s gun on campus, after seeing her kiss her ex-boyfriend Mat. Callie admits her past relationship with Brandon to her moms. But before Stef and Lena can even process the information, the school goes into the “Code Blue” lockdown.

The episode was rated 8.20 from 558 votes.

In the midseason finale, Callie and the family set-up a Justice for Jack booth at the music festival in the hopes of stopping Justine's foster-care bill; but Callie's advocation for both Kyle and Jack puts her in danger. Meanwhile, tensions between AJ and Aaron escalate; and Mariana flees from the festival after seeing Nick, leading the family to frantically search for her.

The episode was rated 8.23 from 487 votes.