[s1e4] The Stranger Instant

: This episode reveals that Katz is the father of Olivia, the girl who mysteriously collapses at a football game. It also introduces a potential affair in Adam’s own past with a woman named Sally Prentice. The Stranger – Season 1 Episode 4 Recap & Review

: The Stranger continues her pattern of "copycat" behavior to unsettle her targets. When she confronts Adam's father, Ed Price, she mimics his lunch order exactly to establish a presence before revealing a secret child from his past. [S1E4] The Stranger

: After being confronted by the Stranger, Ed Price experiences a sudden shift in perspective, attempting to reconcile with Adam and be a better grandfather—though his intentions are met with suspicion. : This episode reveals that Katz is the

Other notable plot developments and features in this episode include: When she confronts Adam's father, Ed Price, she

In episode 4 of Netflix's , titled "Secrets," a key "useful feature" for the characters is the use of GPS location tracking apps . Adam Price’s sons, Thomas and Ryan, use a tracking app on their phones that was originally set up so their mother, Corinne, could monitor them. In a desperate attempt to find her, the boys realize they can use this same feature to trace Corinne's own phone, which eventually leads them to a train station and then a bridge.

: The investigation into Heidi’s murder pivots when Katz, a corrupt detective, attempts to destroy evidence by volunteering to review and then wiping CCTV footage from the cafe.