Shortly after Becky’s shocking reappearance, the Swain family is embroiled in a new drama: Betsy Swain is arrested at school, and DI Costello is in the middle of the seat of power, seemingly “the mastermind” of this.

On a morning like any other, Betsy is seen with her hands clasped behind her back, being led out of the chaos of students and teachers.

Carla and Lisa are shocked to hear the news — they rush to the police station — only to find their daughter sitting in the small window of the holding room, exhausted and confused.

When Costello walks over, he looks at Becky and says: “If you don’t disappear again, things will get worse for Betsy.”

According to spoilers from Radio Times, Costello accuses Betsy of vandalizing a police car, resisting arrest, and trying to attack him. But Betsy remains silent, her eyes looking into the distance as if she wants to say something but can’t. The strange thing is that when Costello mentioned the name “Becky Swain,” both Lisa and Carla froze, their faces pale. It felt like they knew too much, but couldn’t say it.

The story of this arrest was not simply about Betsy’s crime — it was more like a trap set up to force Becky to reveal herself or let go. Costello was using the power of the law as a double-edged sword: if Becky didn’t cooperate, she would watch her daughter suffer.