Episode 4

S1, E4: Suspect Halliwell was arrested in Fulcher on suspicion of murdering two women, but abruptly invoked his right to remain silent, stalling the investigation. However, bloodstains found in Halliwell's car were confirmed to belong to Sian. Furthermore, unknown DNA was detected from a confiscated perfume bottle, leading Fulcher to suspect multiple victims and reignite his determination to pursue the investigation.