In real life, there were no secret tunnels found under 657 Boulevard.
Real-world investigators did find female DNA on one envelope, but it did not lead to an arrest or a breakthrough in the case. Deep Dive Resources
Ellie discovers a Facebook group for former students of an English teacher named Roger Kaplan , who used to have his students write "love letters" to houses. This makes Roger a primary suspect for the origins of the Watcher's poetic and creepy writing style. Fact vs. Fiction The Watcher s01e05
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A major turning point occurs when DNA testing on a letter envelope reveals it belongs to a woman. This immediately places Nora and Ellie under suspicion, but also broadens the field to neighbors like Pearl . In real life, there were no secret tunnels
The episode ends with the contractors discovering a hidden, Prohibition-era tunnel in the basement. Dean and Nora find evidence that someone has been living there, and the episode closes with them chasing a mysterious figure through the passage.
While the series is famously based on a true story, this episode introduces several highly fictionalized elements: This makes Roger a primary suspect for the
To dive deeper into the mystery and the real-life events that inspired it, check out these sources: