S15·E4 Atomic Monsters

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S15E4 (Atomic Monsters).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Do not invent/guess titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points.
If a detail is not in the material, omit it.
Write original, neutral, encyclopedic prose in plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
TMDB Episode Synopsis: Sam and Dean investigate the mysterious death of a girl and the disappearance of another.
Series Sources:
Series title: Supernatural.
Created by: Eric Kripke.
Cast: Jared Padalecki (Sam Winchester), Jensen Ackles (Dean Winchester), Jim Beaver, Misha Collins.
Premise: Two brothers follow their father's footsteps as hunters, fighting evil supernatural beings like monsters, demons, and gods.
Broadcast history: First broadcast on The WB, later The CW. Ran for 15 seasons from September 13, 2005, to November 19, 2020.
Backstory: Sam and Dean lost their mother to a mysterious and demonic supernatural force. Their father raised them to be soldiers and taught them how to kill paranormal evil.
The synopsis for S15E4 is extremely brief: "Sam and Dean investigate the mysterious death of a girl and the disappearance of another."
The sources provide context about the show, the characters, and the creators, but very little about the specific plot of this episode.
Problem: The user wants a 280-380 word recap. However, the provided synopsis only contains one sentence of plot information.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing." and "Never add dialogue, scene order, character names or plot events not explicitly present."
Conflict: I cannot reach 280 words without violating the "never invent or guess" and "only verifiable facts" rules. If I write 300 words about a one-sentence synopsis, I will be inventing details, which is strictly forbidden.
I must write what is there.
The synopsis says: Sam and Dean investigate the mysterious death of a girl and the disappearance of another.
I can include the series context (who Sam and Dean are, what the show is about) to provide an encyclopedic entry, but I cannot expand the plot of the episode itself.
Wait, the prompt says "Write a grounded 280-380 word episode