'The Fosters' season 4 spoilers news: Callie's efforts to help puts her life in danger; Nick threatens Mariana in 'Collateral Damage'

Callie (Maia Mitchell) and Mariana (Cierra Ramirez) will both be in too deep in the upcoming summer finale of Freeform's family drama, "The Fosters" season 4.
Next week's final episode for the summer will see how Callie's efforts to help people will bring further conflict and jeopardize her life while Mariana continues to push herself to the limit.
According to the official synopsis for "Collateral Damage," Callie and the rest of the family join the music festival to set up a "Justice for Jack" booth. Their main objective is to gather signatures for the petition to stop Justina's (Kelli Williams) foster care bill, but Callie's determination in advocating for both Kyle (Adam Irigoyen) and Jack (Tanner Buchanan) will lead her to a complicated situation. Furthermore, Callie's efforts will be sidelined when the growing tension between her boyfriend AJ (Tom Williamson) and her friend Aaron (Elliot Fletcher) comes to a head.
Mariana, on the other hand, is still taking Jesus' (Jake T. Austin) ADHD prescription medication. She sees her former boyfriend Nick at the music festival, leading her to run away out of fear while the whole family frantically searches for her. Meanwhile, Stef (Teri Polo) will discover that her involvement in Kyle's case will affect her job as a law enforcer.
The promo clip for episode 10 has been released, and it features Mariana on edge when Nick begins threatening her again. "I can finally touch you again," Nick tells a scared Mariana over the phone. The next scene shows Brandon (David Lambert) finally knowing the results of his Julliard audition. Jesus confronts Nick and tells him to leave Mariana alone, but Nick later shows up to the festival to chase Mariana. The last moments of the trailer show Nick commanding Mariana to get in his car.
Catch the summer finale of "The Fosters" season 4 on Monday, Aug. 29 at 8 p.m. EST on Freeform.