Stef learns that her mother is having second thoughts about getting married. Meanwhile, Emma attempts to come clean with Jesus by writing him a letter, but finds out he is hiding a secret of his own.

Stef starts a new assignment in human trafficking and meets a teenage girl who turns tricks on the streets. Elsewhere, Lena deals with repercussions of holding an off-campus LGBTQ sex education class. Callie's pursuit of justice impacts her relationship with AJ.

Lena is at her wit's end when everyone comes to her to handle all their crises and Stef is never around to help. Elsewhere, Aaron invites Callie on a road trip to visit his parents, and Jude resorts to bullying tactics of his own after being fed up with being bullied at school.

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 defence 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.

Callie must decide to take a plea deal and go to jail for three years or go to trial and risk an even longer sentence. Meanwhile, Stef and Mike ramp up their investigation into the murder. Lena confronts Drew about his campaign, Mariana rallies her fellow students to protest, and Jesus starts to put together the pieces about Emma.

Stef frantically searches for Callie after she offers to help Diamond. Jesus struggles with his TBI and unleashes his anger after discovering Brandon helped Emma with a deeply-personal decision, and protests continue over Anchor Beach Charter's privatisation, with Mariana leading the charge.

Callie gets control of her life and applies to audit art classes at a local college. Jesus distances himself from Mariana and Brandon so he can build his tree house with Gabe alone, and the Fosters get a new neighbour.

Callie and Aaron go on their first official date. Mariana and Jude spearhead underground school newspaper. Noah and Jude question compatibility. Brandon and Grace take relationship to next level.

Callie and Aaron discuss taking their relationship to the next level. Mariana finds fulfilment training with the Latina derby team. Grace catches Brandon playing hero to his ex-girlfriend Courtney.

The Fosters kids attend a party at the Derby warehouse, but things escalate quickly when the cops show up. Lena struggles when Stef starts to become obsessed with an ongoing case at work, meanwhile Brandon's relationship with Grace is put into jeopardy witch Courtney back in his life.

Callie is torn with turning over a new leaf or supporting a cause that means a lot to her, while Jude and Taylor begin making gaming videos that earn them unwanted notoriety.