CER is my wheelhouse. I start every school year with a CSI mystery. Caution tape goes up outside my classroom, CSI music plays, and students pull out their investigation notebooks. After that, I like to run a mystery every quarter as a fun way to practice.
October is the perfect time for a spooky Halloween Science Mystery.
Is the Ravenwood Inn haunted?
That’s the one question your students have to answer. The Ravenwood Inn was built in 1878. A man died in Room 5 in 1912, and the town has whispered about it ever since.
In 2024, Grant Mercer bought the house and opened it as a bed-and-breakfast. Then the guests started talking. A cold spot by the north wall. Objects rolling to one corner of the room. A shadow after dark. The feeling of being watched.
Three paranormal teams came out with their instruments. Then on October 2, the curtain started pulling back on its own with the windows shut and latched. It kept happening, and finally it happened right in front of a research team.
Your students are the fourth investigation team.
What students investigate
Students work through a full case file:
- An incident report with photos and a property map
- Five people of interest: the owner, the groundskeeper, the housekeeper, a rival inn owner, and the original 1878 owner
- Four paranormal investigation reports with data tables for EMF readings, wall temperatures, infrasound, and marble tests
- Newspaper clippings from 1912, 1971, and 2024
- The housekeeper’s turnover log and her handwritten journal
- Evidence photos of the building and the attic, including a surprising find
- Reference cards with the background science and a radio remote
The data is real science. The readings match how old houses actually behave, with old wiring, drafty windows, a sloped floor, and a fan humming below what you can hear. Students have to decide if any of it adds up to a ghost.
How it runs
It takes about 2.5 class days and comes in print and digital for grades 6 to 8.
1. Read the Solve the Case story together.
2. Go through the incident report and record the key information.
3. Read the people of interest profiles and make a first guess.
4. Work through the investigation reports, newspaper archive, housekeeper’s log, and evidence photos in the notebook.
5. Small groups decide on a claim.
6. Each student writes their own CER, then a final paragraph.
Halloween is on a Saturday this year, so most of us are celebrating on Friday, October 30. If you start on Wednesday, students are writing their final paragraph on Friday. It’s Halloween without losing instructional time.
After step 3, have students hold on to their first guess. When they finish, ask them which piece of evidence changed their thinking the most.
Why the claim is so simple
The claim is either “The Ravenwood Inn is haunted” or “The Ravenwood Inn is not haunted.” No “because” at the end.
That’s on purpose. When students try to pack their whole argument into the claim, the evidence and reasoning get thin. Keeping the claim short pushes all the thinking into the evidence and reasoning, which is where it belongs.
Support built in for every reader
The case doesn’t read like a science textbook, so it holds the attention of students who don’t love to read. Sentence starters, CER frames, a graphic organizer, a student self-check, and a rubric are all built in, so every student has a way into the writing.
For you, there’s a guided teacher presentation (115 slides), a student journal in print and Google Slides, and an answer key.
Why students have to reason through this themselves
AI can write a CER paragraph in seconds. What it can’t do is sit with this case file. The answer isn’t in one document. It’s in how the data tables, the housekeeper’s log, and the photos line up, and students have to notice that, connect it, and argue for it. That’s the kind of thinking we want students doing, especially now that AI is everywhere.
More mysteries in the series
The Haunted House Hoax is part of my CSI CER series. There’s also the Dead Fish case, the Lemonade case, and the Acid Rain Garden case, where students dig through soil pH logs, rainwater data, and a site map to figure out what damaged the school garden.
Run a mystery this October
Looking for more October ideas? Here are 10 fall science activities for middle school.
You can build your own mystery, or grab the Haunted House Hoax CER mystery with the whole case file, data, and supports ready to go.
Do you run a mystery in October? I’d love to hear which one your students get into.
