Stef and Lena try to find time to work on their relationship, while Lexi and Jesus have to deal with the consequences of their actions.

When the family takes a vested interest in AJ, Callie has doubts about whether she can trust him. Stef surprises Lena with some news about Monte. Meanwhile, Jude has trouble moving on from the trauma of the shooting incident.

The family heads to Idyllwild for Brandon’s music competition where long-held feelings are revealed and life-changing secrets are unveiled.

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. Meanwhile, Jude is hurt to discover that Connor came to town and didn’t tell him, and Brandon considers drastic measures to make extra money.

Callie and her friends support Ximena in a big way at a conservative anti-immigration rally and get a lot of buzz for Ximena’s plight. Meanwhile, an unlikely source offers a key piece of evidence that may help save Anchor Beach from going private and the family celebrates Stef’s birthday.

Brandon and Grace plan the ultimate senior prank which ends up going a little too far. Mariana and Mat make a huge decision about the future of their relationship.