In episode 4, Charlotte and Mel begin to uncover secrets about Jess's past, which contribute to the rising tensions within the group and the scrutiny Jess faces as social services get involved in her family life.

Ed Carrisford is shown trying to keep the peace within the family while struggling with guilt over the situation involving his daughter Betsy and the child protection investigation that has been launched against Jess and himself.

Jess's account of the accident involving baby Betsy is inconsistent, and her behavior becomes increasingly erratic, which raises suspicion and complicates the investigation by social services and the police.

Dr. Liz Burgess is torn between her professional responsibility and loyalty to her friend Jess. She is haunted by her own family history while trying to navigate the difficult situation, and she is involved in examining baby Betsy and dealing with the emotional strain of the investigation.

Mel and Charlotte are drawn into the drama surrounding Jess's family. They bring their own biases and histories to the situation, which affects their perceptions and interactions, contributing to the tension and complexity of the unfolding events.